FAQ — GMC Sierra


What is The Best Option for In-Bed Storage For a GMC Sierra?

GMC Sierra Owner: What do you recommend for in-bed storage on a GMC Sierra 1500? We need something to kind of cut across the back of the truck a couple feet in where the hooks are to kind of keep our stuff from sliding all the way to the bulkhead. You got any recommendations on that? Something y'all offer?

Shaun: Let's see here.

GMC Sierra Owner: I don't know if this matters because I almost pulled the trigger on something off of Amazon, some kind of organizer bar. But I forgot, the new body style, the bed, what they've done is made it wider on the inside.

Shaun: Right.

GMC Sierra Owner: The bed is, what is it? 71 and a half inches wide on the inside, and I guess it used to 69 or 70. And that seems to matter apparently on things I've looked at because it's wider than some of the things out there. I was going to get one of those little tension bars to go across the back to kind of give us something, some kind of back board there. And they're all 70 inches wide, and I didn't know if that mattered to anything you might have.

Shaun: They have something that Roll N Lock makes, but it only works for their covers. And then TruXedo makes something called a Truck Luggage, but I don't know if it stops everything as much as it is just something hanging there that you could put stuff into.

GMC Sierra Owner: I got you. Yeah I'm thinking something that we put the groceries in the back. If we got the cover, we're just going to pop open the tailgate and put groceries or stuff from the store, whatever, shopping, whatever. I'm just thinking something like that, that'll keep that kind of stuff from rolling around.

Shaun: Yeah and I think this might actually be something that you'd like. Hold a second here. I'll send you this email too, and let me know what you think. I know there are a lot of other options too, so if you find something that you like bring me a part number or tell me what it is, and I'll look it up. And I'm sure I can give you a good deal on it.

What is the Best Scratch Resistant Waterproof Tonneau Cover for a 2019 GMC Sierra 1500?

GMC Sierra Owner: I have a 2019 GMC Sierra 1500 with a 5'8 bed, and I need a tonneau cover.

Shaun: What kind of cover were you looking at?

GMC Sierra Owner: Well, you sent me an email on a couple that, or three of them that kind of go over the top. Two from Extang and one from Retrax.

Shaun: Okay.

GMC Sierra Owner: But I think from looking at those and kind of figuring it out, I think we're more in line to do one of the covers that, what do you call it? Low profile? The one that's not on top of the bed, it's in the bed.

Shaun: The tri-fold.

GMC Sierra Owner: The tri-fold. Tri-fold or a roll up, but it looks like the roll ups cost a heck of a lot more.

Shaun: Correct, yeah the Retrax, the aluminum version, which is one with the life-time warranty on it. That one costs more. Are you wanting to get a BakFlip or something like that?

GMC Sierra Owner: Yeah, I'm thinking so. The email I got a couple of weeks ago had the BAKFlip MX4. I like that one. And I was kind of Googling it last night and checking out some reviews. Apparently, folks like it, except that they say it scratches pretty easily.

Shaun: Alright, the one you're going to want, if you're going for the tri-fold, the one you're going to want is UnderCover Armor Flex. It's got LINE-X on it. You can't scratch that cover.

GMC Sierra Owner: Got you. And is it a matte black or a shiny black?

Shaun: Matte black.

GMC Sierra Owner: Okay, and it's pretty good on the water spilling off? Here it is. They're all about the same aren't they, when it comes to that?

Shaun: Yeah, and this one's actually got a five-year warranty instead of a three.

GMC Sierra Owner: Oh, okay, yeah if you could shoot me that one in an email I'll take a look.

Shaun: Okay, I'm going to send you the actual order form. All you got to do if you want to go ahead and do it is click proceed with that. 

Is the BAKFlip MX4 for a 2019 GMC Sierra Scratch Resistant and Secure?

GMC Sierra Owner: Yes, I just got pricing online for your BAKFlip MX-4

Shawn: Okay, did you want go ahead and place an order for one of those today?

GMC Sierra Owner: Well I'm not sure. I've never seen this one and I was looking at your website and people had several different ones on there. And I didn't know if I like the idea of this one being able to flip up one, two or three and lock in place. Do you have others like that?

Shawn: We do, but the BAKFlip MX4 is actually one of the best on the market. 

GMC Sierra Owner: Oh okay. So is the MX4 kind of a matte, scratch-resistant, non-fade out looking thing?

Shawn: Correct, yeah. It's got the heavy duty aluminum panel so they're dent resistant, scratch resistant. It's got the dual action tailgate seal where you can open and close your tailgate without opening the cover.

GMC Sierra Owner: So if I shut the tailgate and lock it is someone going to be able to get into this? Or is it secure?

Shawn: If they want to bad enough they'll be able to get into anything. But in theory, no, you have to have the tailgate open in order to operate the mechanism.

GMC Sierra Owner: Okay 'cause I drive an Avalanche now and I'm just getting rid of it, it's a GMC but I can't get that locking Avalanche thing. And so okay, let's see, yeah I'd like to have one delivered I guess. What all do you need?

Shawn: Okay so what, you said you've got a GMC?

GMC Sierra Owner: Yeah I have a 2019 GMC Sierra 1500, it's the crew cab with the short bed. And I'm not sure if it's five and a half, or five foot eight. Do I need to go measure it real quick? Yeah it's the new body style, 2019.

Shawn: No it's fine, what you've given me is plenty. Short bed, it's either gonna be a short bed or a standard and standard is six and a half, and you'd know if it was that.

GMC Sierra Owner: Yeah it's not that. I measured outside and I couldn't tell if it was five foot five or five foot six. I don't know if you measure from inside or outside or what.

Shawn: Yeah they do it from the inside of the tailgate to the outside, inside of the bulkhead to the inside of the tailgate.

GMC Sierra Owner: I know that BAKFlip makes a G2 or something, but it's kind of a shiny rough finish isn't it? Or do you not carry that one?

Shawn: Yeah, no the G2, it's a shiny finish and then it's also got thinner panels. It doesn't have that seal that you can open and close your tailgate. You got the good one.

GMC Sierra Owner: Good, okay 'cause I've never seen this and I just want to make sure 'cause I really like that Avalanche I have the way it's done. Okay well I appreciate all your time and help.

Shawn: You got it. Have a good day my friend.

What's The Difference Between The MX4 and Ultra Flex for a 2018 GMC Sierra Short Bed?

GMC Sierra Owner: Hi, Peter. I found y'all online looking up Tonneau covers. And I think I'm between the BAKFlip MX4, and the Undercover Ultra Flex. Could you help me?

Peter: Yeah. What truck is it for?

GMC Sierra Owner: It's for a 2018 GMC Sierra short bed. What's the difference between the MX4 and Ultra Flex?

Peter: Okay. They're very similar. I like the Undercover Ultra Flex. It has a longer warranty, so you've got a five-year warranty, where the MX4 has a three-year. And when you have it completely open, it doesn't rest against the cab like the MX4 does. But they're both really great covers. You can't go wrong with either.

GMC Sierra Owner: Okay. What is the price difference between them?

Peter: The Ultraflex is going to be about $40 more, but like I said, it has a longer warranty. It's free shipping on both and there's no sales tax if you're ordering from outside of Arizona.

GMC Sierra Owner: Is one more durable than the other, or they about the same?

Peter: No, they're the same.

GMC Sierra Owner: Okay. All right. I guess I'll go with the Undercover Ultra Flex then.

Peter: Okay. I'm going to get this shipped out today. You should have it by Thursday or Friday.

GMC Sierra Owner: Wow! That's great! I just got an email confirmation.

Peter: Yeah! And you're all set.

What's a Comparable Tonneau Cover to the BAKFlip MX4 for a GMC Sierra?

Sean: Hey. So I just got your email today. I was out after we spoke yesterday. You had a BAKFlip before. What kind of cover are you looking at? Are you looking at wanting to do a BAKFlip again or something comparable?

GMC Sierra Owner: I liked the BAKFlip. I just needed to fit. It seems like it's about a half inch too short. I've been working with James, and he's in the same email, and we tried a lot of different variables. I've tried to push it all the way up against the truck, like the directions call for, then it's a half an inch too short in the back. So I've got a gap that I could just about stick my pinky fingers through. If I try to split the difference and then it leaks on both hands and then I sit it the way it's supposed to at the tailgate. Then it doesn't have enough lip on the front and it's half inch too short up there so that leaks up there. So that's how we got to where we are.

Sean: Right. Let me see here. I think I sent an email about drilling some holes in the cover.

GMC Sierra Owner: I liked that actual style for it that flips. And that one holds like three or four hundred pounds distributed, and it doesn't fade because it's the poly stuff. I've read that the aluminum ones chip and then you can see the aluminum underneath. So that's the reason I was trying to get the poly or whatever you call it.

Sean: Did you get my email about drill some holes in it?

GMC Sierra Owner: Yeah, I figured that ... so they just want me to just randomly go through there and drill holes and then get rid of it and send pictures.

Sean: Yeah. Destroy the cover. 

GMC Sierra Owner: That seems unfortunate. 

Sean: I know man. I actually worked for Undercover, which is BAK's sister company. Just the whole process, getting them back, having people go through and make sure they're good, chances are they're going to be scratched. You know what I mean? It's just more work.

GMC Sierra Owner: I love the cover. I just don't want her to leak.

Sean: No, I know. Here's the tough part of the conversation here. So we tried the BAKFlip. You're set on that style I hear, because of the finish and because you feel it's going to be a better finish. I can't agree or disagree. I've never heard of the flaking problems that you're having and I worked for them, you know, so I, I've never seen that personally. It might be something new on the MX4. MX4 is kind of a new cover. I wasn't around the whole time during that.

GMC Sierra Owner: It's just what I've saw on the Internet.

Sean: Right, but what I was going to say is, I can get you the credit on this one as soon as you give me those field destroy pictures. And then what I'd honestly like to get you into is the Undercover Armor Flex. Unfortunately, it's a little bit more money. 

GMC Sierra Owner: Tell me about it. What's it's specs?

Sean: Okay, so what it is, it's going to be the same exact look as your BAKFlip. The only difference is, it's got a five-year warranty because it's got Linex on top of the cover. So the cover looks just like your BAKFlip, but it's got that Linex coating. So you could take a key to it and go back and forth on your cover, you're not going to scratch it. It's something new they started doing. Like I said, five-year warranty. It looks exactly the same. The only difference is whenever you fold it all the way up, it stands in the 90 degree angle instead of leaning against your cab. So it does tend to block that third brake light on some vehicles. I'm not sure if it will on the new Sierra, but that's the only difference between the Undercover and the BAKFlip product, are those three things. The warranty, the finish and the functionality.

GMC Sierra Owner: What causes it to not lean against the back window? Because that one comes just underneath it. I have a camera near the third light. It's a digital LED camera that's in there. That's how I see out my back window.

Sean: Right. Well here's a little bit of inside knowledge. So an Undercover historically made a one piece ABS Tonneau cover, okay? We obviously realize that industry is going towards the folding. So what did we do? We saw BAKFlip and we said, okay, we're going to start making that. So the leaning against the window is something that was either patented or something of that nature to where we couldn't do that. So that's why it stands at a 90 degree angle. It's held by prop rods, and they work flawlessly. Again, I don't know how often you drive with it all the way up, and they are really easy to remove if you know you're going to be driving with it all the way up, if that's going to be a a common occurrence for you.

GMC Sierra Owner: What stops it from leaning forward to try to hit the window if you break or take off?

Sean: Well, I mean they've got the prop rod on either sideand they're quick release prop rods, but they've got like a ball stud in the rail and then a ball stud on the cover itself.

GMC Sierra Owner: Okay. And it's still basically three folding pieces. And what's the weight that it holds?

Sean: The weight on that one I believe is going to be the same as BAKFlip. They don't actually mention it here on their website unfortunately, but I believe it is four to 500 pounds evenly distributed, of course.

GMC Sierra Owner: Okay. And it says that it fits my truck and install the same way without me having to drill holes in my truck?

Sean: Yes sir.

GMC Sierra Owner: Okay, well I'll give it a try.

Are There Any Folding Tonneau Covers for a GMC Sierra That Are Water Resistant?

GMC Sierra Owner: I have a folding tonneau cover now. Do you recommend any other covers? I mean, mine leaks. The water doesn't bother me so much, but I'm just curious if there are any other folding covers that might be better and also easy to install.

Sean: Well, I just want to pre-warn you that I was actually with Undercover for a decade and they bought BAKFlip and a lot of tonneau cover companies that are actually owned by the same company, which Truck Hero. It's the name they're owned under, and folding covers are as far as water goes, the Achilles heel of the industry. We've done everything from different rivets, screws, seals, gluing, processes, everything. Unfortunately, on a folding cover, you're not able to keep 100% of the water out. Now, there are things in place with the drain tubes and the rails are channeled like a gutter, it's supposed to push the water to the drain tube and out the head if the rain tubes are installed properly. Which is going to unfortunately, require either some cutting if you have those little black plastic caps in the front of your bed, or some drilling if you don't, in order for those drain tubes to get out of the bed, so that's going to be the toughest part of the installation right there. The rest of it you're going to get two rails and eight clamps, you're going to have four clamps on the other side. Then the cover actually comes with elevator bolts and star knobs so essentially you sit the cover down on your bed, you go to the very front close to the window, put the elevator bolts through, and then from the underside you screw the star knobs on and your cover's installed, so that's as easy as it is. Well, I'm not very mechanically inclined and I've done about 50 of them, so.


GMC Sierra Owner: Well that means you know what you're doing.

Sean: Now I do.

GMC Sierra Owner: Do you recommend any other covers? I mean, the water doesn't bother me, mine when it's down, my bed is running water.

Sean: That's a little crazy there. As far as the look goes, the MX4 is going to be right there. If you didn't care about the low profile and sitting between your truck bed rails and you wanted something more that's going to sit on top of the rails, I would have you check out the Extang, and that's the Solid Fold. That one sits on top of the rails, but that allows less water intrusion, it folds the same way. It does not fold up against the back window. So you can't have the cover all the way open when you drive but you can have two panels open if you need to hold something tall. The good part about the Solid Fold is, it's cheaper, and it does not come with a separate rail system. At the front of the bed, at the very front panel toward the glass, you're going to have these two knobs that come down and it has a little lip on it, you loosen it enough so you can get that lip underneath your side rail, and then you clamp it shut. You do that on either side and that's how it secures it to the truck. When you fold it all the way down, the rear-end has sort of the same thing, except for those are spring-loaded, so you can tighten them wherever you need to. Let's say it's a little loose, so you just grab that handle, twist it, which will tighten it, and once it has that lip on there, and you clamp it over, it'll pull it down towards the bed.

GMC Sierra Owner: Oh, my goodness. So you have a little less water?

Sean: Correct. Anything that's going to sit on top of the rails, as a rule of thumb, you're going to have less water intrusion. Fewer opportunities for it to get in there.

GMC Sierra Owner: I'm still open to what you're saying. I'm just going to go transfer some money into my account and I'll call you back.