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FITS 2018 Ram 2500
Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate

Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate

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Tonneau Covers
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2018 Ram 2500

6-1/2 Foot Bed - without RamBox

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AB0040029 - Aluminum Lomax Tonneau Covers
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The best technical support and full tonneau covers installation instructions. Lowest price 2500 tonneau covers guarantee and expert service. Ram 2500, 2018 tonneau covers by Lomax are available from For expert service call 1-636-306-4830 to order your Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate part number AB0040029, or order online at
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2018 Ram 2500 - Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate

  • Fold-Up Tonneau
  • Hard Tonneau
  • Lomax
  • Diamond Plate
  • Tri-Fold Tonneau
  • Low Profile - Top of Bed Rails
  • Aluminum

Tri-fold cover secures to side rails at 10 points for maximum security for your truck bed and cargo. Heavy-duty, lightweight aluminum panels feature a diamond plate finish for a bold, aggressive look. Easy to remove without tools for full bed access.


  • Custom-fit, hard tonneau cover protects your truck bed and cargo from the elements
  • Tri-fold design - cover folds up for quick access to two-thirds of your bed
    • Integrated storage clips with retractable straps keep folded panels secured
    • Folded panels can be easily removed without tools for full bed access
  • Low-profile cover sits approximately 1/2" above the bed rails for a streamlined look
    • Reduces wind drag and improves fuel economy
  • Latches at the tailgate let you easily open and close cover
    • Panels automatically secure to side rails at 10 points as they are unfolded
    • Closed cover locks truck bed when used in conjunction with closed and locked tailgate
    • Release cables at tailgate let you easily open cover from driver's or passenger's side
  • Impact-resistant aluminum panels are heavy duty yet lightweight
  • Durable aluminum side rails support panels with a high strength-to-weight ratio
    • Leave stake pockets uncovered for use with racks and other gear
  • Rubber seals and reinforced, vinyl-coated panel hinges keep water and dust out of truck bed
    • Slight arc in cover also helps shed water and eliminates the need for drain tubes
  • Diamond plate finish provides rugged styling for a robust appearance
    • Industrial design matches toolboxes and accessories on contractor/professional vehicles
  • Simple, no-drill installation
    • 8 Tight Bite clamps secure cover side rails to truck bed rails
    • Panels secure to side rails with hooks and latches
  • Made in the USA


  • Weight capacity: 500 lbs
  • 3-Year limited warranty

The Lomax hard tonneau cover provides complete protection for your truck bed and cargo. The tri-fold panels latch to the cover side rails at 10 points for enhanced security. These lightweight, impact-resistant aluminum panels can also be removed in seconds without tools for full bed access. The watertight cover opens with the pull of a cord at the tailgate, and it stores in the folded position at the cab with integrated storage clips and retractable straps.

Tri-Fold Design for Easy Bed Access

Fold panels for quick truck bed access

The cover has 3 panels that fold up for easy access to two-thirds of your bed.

Latch with release cable

To open the cover, simply pull one of the release cords on the driver's or passenger's side near the tailgate. Fold the rear and center panels on top of the front panel. There are built-in handles included to make this process easy.

Storage clips with retractable straps

The folded panels secure in place at the cab with integrated storage clips with retractable straps. Vinyl-coated spacers with rubber pads protect the folded panels by keeping them properly spaced. This ensures the cover will stay firmly in place while driving on a bumpy road, and limits metal-on-metal contact to reduce noise and vibration for a quieter ride.

Panels folded up for hauling flexibility

You still have plenty of rear window visibility with your tri-fold tonneau open. You can also haul long or tall items at the tailgate while still covering up cargo such as a toolbox that's stored closer to the bulkhead of the truck.

To access your full truck bed, lift up on the folded cover, and slide it away from the bulkhead of the truck. This will disengage the mounting hooks from the front catches on the side rails and allow you to completely remove the panels from the bed. Unlike many soft or hard covers, there are no hook-and-loop fasteners, snaps, or hardware to struggle with while operating the tonneau.

Rugged, Low-Profile Design

Low-profile design

The low-profile cover sits approximately 1/2" above your truck bed rails for an overall streamlined appearance. This aerodynamic design - when paired with a covered truck bed - also reduces wind noise and drag and helps to improve fuel economy.

The Lomax Professional Series features a diamond plate finish that is great for contractors, professionals, or anyone who wants a cover that looks stronger and tougher than the usual tonneau. The finish resembles truck toolboxes, fenders, and other accessories with a diamond tread pattern. It also adds a brilliant shine and resists corrosion.

Maximum Security

This hard cover is great for protecting your fifth wheel or gooseneck connection. It deters theft far better than soft covers that can be cut open with a knife. There are no exterior latches, so no one can access your truck bed.

Hooks and latches highlighted

The tri-fold panels automatically secure to the side rails at 10 points when closed. This helps to prevent would-be thieves from prying open the cover. These 10 security points consist of 2 hooks that slide into catches at the front of the truck bed, 4 additional hooks that fasten along the aluminum channels, and 4 latches that automatically engage to the side rails when the cover is lowered into the retainment brackets. Your cargo and truck bed are completely secured when the cover is closed and your tailgate is locked.

Heavy-Duty Construction

Closed cover protects cargo

The 3 heavy-duty panels are constructed of high-caliber aluminum that is 20 percent stronger than aluminum truck body parts. These impact-resistant panels can withstand hail and falling objects.

The tri-fold panels hold up to 500 lbs. of evenly distributed weight, yet they are light enough to be picked up by one or two people. The tonneau cover only weighs approximately 60 lbs. for a high strength-to-weight ratio.

Weathertight Protection

Weathertight rubber seal

The tonneau cover is designed to seal your bed from the elements to protect your cargo. To prevent water and dirt from entering the truck bed, the cover overlaps the bed rails with continuous watertight rubber seals along the entire length of the side rails. The vinyl-coated panel hinges are also waterproof.

Additionally, the cover has a barely visible arc to route water off the cover in the same way that a road has a slight grade to shed rain away. This water-shedding design - coupled with the other weathertight features - eliminates the need for drain tubes.

Simple, No-Drill Installation

The cover rails mount to the inside lips of the truck bed side rails. Simply place each rail against the lip and secure it in place with 4 Tight Bite clamps. Your stake pockets are not covered up, so they are still free for accessories.

Installing panels onto side rails

Angle the cover towards the bulkhead of the truck and slide it forward along the side rails until the mounting hooks engage the front catches on the side rails. Lower the cover into the retainment brackets, and unfold the cover. The cover will automatically latch to the side rails as you unfold it.

Safety straps with carabiner

For additional safety, attach the carabiner on the safety strap to the bracket located between the front and center panels.

B0040029 Lomax Professional Series Hard Tonneau Cover - Tri-Fold - Aluminum - Diamond Plate

Item # AB0040029

Installation Details AB0040029 Installation instructions

California residents: click here

Video of Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Lomax Professional Series Hard Tonneau Cover Installation - 2013 Ram 2500

Today we have a 2013 Ram 2500. We're going to take a look at, and show you how to install this Lomax professional series hard tonneau cover. Now this is going to be a folding style tonneau cover. It's going to be very strong and durable, and protect your truck bed and the cargo on the inside from the elements.Now these are going to have a nice diamond plate design to the top of them, it's going to give just a pretty nice rugged look to the cover, and add to the style of your vehicle. It's also going to a hide scratches, dents and dings very well, a lot better than some other covers out there.Not only is this cover going to protect your truck bed from the elements, but it's also going to add inaudible 00:00:34 looks to your truck. You don't see a lot of these diamond plated aluminum covers like this.

It's just a nice change of pace from those matte black or glossy black finishes that you see on a lot of other tonneau covers.The covers going to have rubberized weatherstripping all along the perimeter, and that's just going to help keep out water and other debris. Now unlike a lot of other covers, this one's going to have inbed side rails, meaning we're not taking up any space on the top of our truck bed side rails, so we still have full access to our stake pockets should we need them.Now because of the cover does not open from the outside, and you have to open the tailgate to do it, if you have a locking tailgate, your going to get great bed security. I'll be able to access the cover at any point. To access your cover, all you gotta do is open up your tailgate, and then locate the court on the underside of your cover. And then you simply just fold back each section.With the cover in this position, we have partial bed access, and we can actually travel with it like this by securing our strap right here to make sure it cannot go anywhere.

And we're actually going to have this brace with our nice, soft rubber pad on the bottom. That's going to help protect the cover from damaging itself.We're going to have one right there, we're also going to have one towards the back right here, and two more on the other side. Now there's going to be 10 different points that are affording our cover in place when it's fully closed. And how they actually work is this peg right here, it's going to sit under this tab, so you do want to be mindful of when closing the cover to make sure that you engage this peg under the tab and it doesn't get caught sitting on top of it.Now, even though the cover is latched in this position, should those fail at all we do have these safety carabiners attached to it to make sure the cover stays attached to the rails. Our support braces on the underside of the cover are going to make sure that our cover is very durable.

It's going to be able to support 500 pounds of evenly distributed weight, but they're also gonna double as handles to help close and open your cover.Now, like I said, we have inbed side rails, so we're not taking up any space on the top of our side rail caps, but we are going to be sitting in about two inches on the inside of our truck bed, so that's not going to be taken up too much space, if you do decide to travel with your side rails on while the covers removed.The cover is going to have a nice low profile design to it, it only sits about a half inch above our truck bed. We're also going to have this nice rubber strip on the back of the rear panel right here, so when you open up this first panel, it's going to elevate a little bit off of that middle panel to make sure that it doesn't sit flat on top of there.We also have a weather seal on the back side of our side rails that are pressed up against the side of our truck bed side rails, which is also going to help keep water out. There's also going to be a weather seal on the back where the tailgate shuts, so when we close our tailgate, it's going to activate and sit on top of our tailgate.The side of those are held in place by a series of these aluminum clamps, which clamp down on the upper part of the inside of our tonneau cover side rail, and on the back side of our truck bed side rail. You do want to make sure that you're clamping these down onto the metal frame of your side rails on the truck bed, not just the plastic caps.Now even though we only have partial bed access with the cover folded in this position, we can gain full bed access by moving the cover completely, which is pretty easy to do. All we have to do is remove these safety carabiners, and need to locate the strap that's on the underside of the cover right there.Once we pull that down, we can lift up slightly on that part of the cover, and then it just slides right out of it's slot.

You can do this by yourself if you're standing in the truck bed like I am. It's very easy just to grab and remove. When putting it back in place, the easiest way to do that is just to stand it up like so, make sure you get your pegs to line up.We're just going to scoot it up all the way to the bulkhead, and then lean it down and push it in place. Once we have it pushed in place, just latch it down. Now that we've gone over some of those features, let's show you how to get it installed. Now with your cover, your side roads are going to be made up of two different pieces.The shorter end is going to go to the front towards the bulkhead and the cab or the longer piece goes behind it towards the tailgate. So we'll set this aside and start with the shorter one. Now, how it wants to set. You want to make sure this tab is up front to the bulkhead, and unlike a lot of other covers where it uses a lot of the side rail for contact, this one sits on the inside of the bedrail.So we just slide it all the way forward to where it makes contact with the bulkhead. There's a very small lip on the side of our siderail right there. You want to make sure that sitting on top of your truck bed side rail. Once you have it in place, we'll grab one of our clamps. Now making sure that your bolt is facing the outside, we're just going to bring it up, squeeze it down, and then again try to get it as close to the bulkhead as you can. And then from there, we're going to just tighten it with our hand all the way, until we can't anymore.And then we'll grab a half inch wrench and tighten it down all the way. No need to over tighten, just get it pretty snug, and you will have to provide your own wrench. Now one quick note. When installing clamps, you want to make sure that the grooves on the clamp line up with the grooves on your siderail right there so it will just slide in and out like that, but they won't be able to go up and down.At the back of your shorter rail, you're going to have this small little nut and bolt right here. Now make sure you take that nut off and the bolt out, set it right on the siderail. Once we connect the longer side rail, it's going to connect both of them and tighten down to make sure they can't come apart.Now we're going to slide it in place. Just take your time with it, you don't want to mess up the location of your front rail. Once you get it in, just go ahead and push. You want to make sure there's little to no space between your side rails. Let's make sure you cover that as best you can. Put the bolt through with the nuts on the bottom side.Now using a seven sixteenths wrench, we're going to tighten down this nut. Now the second clamp is going to go in between the two parts of the side rail, connecting them. Again, make sure you get the grooves to line up. From there, go ahead and tighten it with your hand as far as you can, and then just grab your half inch wrench, tighten it down all the way.Now your third clamps is gonna go about halfway between your second clamp and a tailgate. Again, make sure you get that siderail pressed up against your truck bed siderail. Once you have the clamp in place again, tighten it down with your hands, and then that same half inch socket. And then your last clamp is just going to go as close to the tailgate as you can get it.Now that we're done with the passenger side, just repeat this process for the driver's side. Now with an extra set of hands, we'll get our cover in place. We'll just lift it up and carry it over to the front. there's going to be a tab on the underside of your cover, you want to make sure you tilt it up and get that tab under the siderail tab so it locks into place.You just set it down, sit that right in the rails. They do include this safety carabiner, it's going to keep your cover attached to your siderails, and do this for both sides. Now we're just going to undo our bungee cord so we can fold out the cover. And from here, you can remove the packaging foam and just toss it in the trash, you're not going to need it.Now we'll continue to fold out the cover all the way. Just make sure it latches properly, give it a quick push, and then just to be safe, go ahead and open it up about three more times and fold it back out just to make sure it's all working properly. Now let's go ahead and close your tailgate and make sure that it's going to create a good seal. We seem to have good seal, so now we're just ready to hit the road.

Customer Reviews

Lomax Professional Series Hard Tonneau Cover - Folding - Aluminum - Diamond Plate - AB0040029

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)

Tri-fold cover secures to side rails at 10 points for maximum security for your truck bed and cargo. Heavy-duty, lightweight aluminum panels feature a diamond plate finish for a bold, aggressive look. Easy to remove without tools for full bed access.


Review from a similar Lomax Professional Series Tonneau Cover in Tonneau Covers

We really like ths cover. Keeps the camping equipment in our truck secure and looks pretty flasy on our Laramie.


Review from a similar Lomax Professional Series Tonneau Cover in Tonneau Covers

Relatively easy to install, looks great and seems to fit well. Etrailer delivered promptly, had great follow up and I will be ordering from them again! Great employees, I loved the self help videos done by the employees..


See what our Experts say about this Lomax Tonneau Covers

  • Measuring Truck Bed Space Between Lomax Professional Hard Tonneau Cover and Floor
    The quickest way to figure that out is to measure your truck bed. Some have truck bed covers or other items in their bed so a general measurement isn't easy to find. For your truck, the bottom of the Lomax Professional Series Hard Tonneau Cover # AB0010019 will sit about an inch below the top of your bed. I attached an install video of this tonneau cover # AB0040029 on a 2013 RAM 2500. The tonneau cover size is different but the side rails sits the same way. At around the 6-minute mark,...
    view full answer...

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Info for this part was:

Employee Tyler C
Edited by:
Tyler C
Employee Colin H
Test Fit:
Colin H
Employee Chris R
Video Edited:
Chris R
Employee Mark S
Written by:
Mark S
Employee Jacob H
Video by:
Jacob H

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