GMC Sierra Camper Shell | ARE Truck Caps
Our MX Series truck cap is engineered specifically for 2014-2025 GMC Sierra 1500, 2500, and 3500 models with 5’8″, 6’6″, and 8′ beds. We build each unit from aircraft-grade aluminum with seamless corners and a powder-coated finish that resists corrosion in any climate.
The MX Series features frameless side windows with dual sliding access, a three-point locking rear door, and integrated LED dome lighting. Factory-matched paint options ensure a cohesive look with your Sierra’s exterior, while our compression bulb seal system creates a weathertight bond to the bed rails.
GMC Sierra fitment & construction details
GMC Sierra Bed Size Compatibility and Installation
We manufacture each GMC Sierra camper shell to match the exact bed dimensions of your truck model year and configuration. The 2014-2018 Sierra 1500 uses different bed rail mounting points than 2019-2025 models, so we engineer cap-specific clamp systems for each generation.
Our installation process takes 45-60 minutes at any authorized dealer location. The mounting clamps attach directly to the factory bed rail stakes without drilling, and we calibrate the compression seal to create even pressure across the entire perimeter. For 2020-2025 Sierra HD models with the MultiPro tailgate, we include tailgate clearance shims to accommodate the fold-down configuration.
Materials and Weather Protection
Aluminum vs Fiberglass Construction
Our aluminum caps use .063-inch marine-grade sheet aluminum with TIG-welded seams and a multi-stage powder coat finish. This construction resists salt corrosion in coastal climates and maintains structural integrity in extreme temperature swings from -40°F to 160°F.
Fiberglass models are molded from RTM composite resin with UV inhibitors that prevent fading and chalking over time. The single-piece construction eliminates leak-prone seams, while the insulating properties reduce interior temperature by up to 18°F compared to aluminum in direct sunlight. We apply a gel coat finish that can be wet-sanded and buffed to restore shine after years of use.
Locking Systems and Security Features
The MX and CX Series use rotary paddle latches with keyed cylinders that match your Sierra’s factory key code when ordered through a GM dealership. We install three-point locking on the rear door with top, bottom, and side engagement points that resist pry attacks.
Side windows include push-button locks on sliding panels, and we reinforce all glass with security film that holds fragments together if shattered. The Z Series commercial model upgrades to industrial paddle latches with hardened steel striker plates and anti-drill lock cylinders rated for high-security commercial applications.
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GMC Sierra Camper Shell Questions
Yes, all our caps are compatible with the MultiPro tailgate system on 2019-2025 Sierra models. We include specific clearance shims that allow the inner gate panel to fold down completely without interference.
The rear door of the cap opens independently from the tailgate, so you can access the bed with the gate up or down. For 2022-2025 models with the available power tailgate, we provide additional mounting brackets that preserve the factory power operation.
When ordering through a GMC dealership, provide your truck’s VIN and we’ll pull the factory paint code directly from GM’s system. We then mix automotive-grade urethane paint in that exact color and apply it with the same clearcoat process GM uses at the factory.
If you’re ordering independently, locate your paint code on the driver’s door jamb label. The code is typically three digits or letters like G1K (Summit White) or GKZ (Graphite Gray Metallic). Send us that code and we’ll match it precisely.
While dealer installation is recommended, experienced truck owners can install a cap with two helpers. The process requires aligning the cap to the bed rails, torquing the mounting clamps to 18 ft-lbs in a cross-pattern sequence, and adjusting the rear door striker plate for proper latch engagement.
We provide detailed installation instructions with torque specs and alignment procedures. The critical step is achieving even compression on the bulb seal around the entire perimeter, which requires measuring gap distances at eight points and shimming as needed.
Aluminum caps like our MX Series are lighter, resist corrosion better in salt environments, and maintain their finish without fading. They’re ideal if you prioritize weight savings and long-term durability in harsh climates.
Fiberglass caps like the CX Classic provide better insulation for temperature control and absorb road vibration more effectively. They can be repaired more easily if damaged and offer a more traditional appearance. Fiberglass is the better choice if you camp in extreme heat or cold, or if you want the option to repaint or modify the cap later.
A camper shell does not reduce your Sierra’s rated towing capacity, as the cap’s weight is supported by the bed structure rather than the hitch receiver. Our aluminum caps add 110-140 lbs depending on bed length, while fiberglass models add 150-190 lbs.
These weights are well within the Sierra’s payload capacity and don’t affect tongue weight calculations. However, if you add a roof-mounted cargo system on top of the cap, that additional weight will reduce available payload for in-bed cargo.
Yes, we offer cutout options for fifth-wheel and gooseneck hitches during manufacturing. You’ll need to specify your hitch brand and model when ordering, and we’ll create a precision cutout in the cap floor that provides clearance for the hitch head and kingpin.
The cutout includes a reinforced edge trim and a removable cover plate for when the hitch is not in use. This maintains weatherproofing and gives you a flush floor surface for regular cargo hauling between towing jobs.
Wash the cap with the same car wash soap you use on your Sierra’s paint, using a soft microfiber mitt or sponge. Avoid automatic car washes with harsh brushes that can scratch the finish.
Wax the cap every 3-4 months using automotive carnauba wax to protect the clearcoat. Clean the rubber seals with silicone spray lubricant twice per year to maintain flexibility and prevent cracking. For fiberglass caps, you can use a buffing compound annually to remove minor scratches and restore gloss.