LEER 100XL Truck Cap – Sleek Fiberglass Topper with Commercial-Grade Protection
The LEER 100XL is our most popular fiberglass truck cap, engineered for drivers who want OEM-quality styling without compromising bed access or security. We designed the 100XL with a low-profile aerodynamic roofline that follows your truck’s factory contours, reducing wind resistance and improving fuel efficiency on highway drives.
Every 100XL features a one-piece fiberglass shell with integrated seamless construction, which means no weak points where water or dust can penetrate your cargo. The frameless rear door opens wide for easy loading, and our three-point rotary latch system keeps your gear secure whether you’re hauling tools to the jobsite or camping equipment across state lines.
What makes the 100XL different
Fiberglass Construction & Factory-Match Finish
We build every LEER 100XL using Sheet Molded Composite (SMC) fiberglass, the same material automotive manufacturers use for durable body panels. This one-piece molded shell resists cracking, fading, and corrosion far better than aluminum alternatives, and the seamless design means zero rivets or joints where moisture can seep through.
Our paint process matches your truck’s exact factory color code using a multi-stage automotive system with UV-resistant clear coat. The finish bonds directly to the fiberglass substrate during curing, so it won’t peel or delaminate like aftermarket spray jobs. If you drive a work truck that spends years in the sun, the 100XL’s finish holds up to commercial use without chalking or oxidation.
Aerodynamic Profile & Fuel Economy
The 100XL’s defining feature is its low, streamlined roofline that slopes down to follow your truck cab’s natural lines. We engineered this profile to minimize air turbulence over the bed, which directly reduces drag and improves highway fuel efficiency compared to taller cap designs.
Real-World MPG Impact
Independent aerodynamic testing shows that smooth-top leer truck bed covers like the 100XL can recover 1–2 MPG on highway trips versus driving with an open bed or a boxy rectangular cap. The flush-mount installation and tapered rear edge let air flow cleanly off the roofline without creating the parachute effect you get with flat vertical rear doors.
Secure Three-Point Latch System & Lockable Access
We equip the 100XL with a frameless rear door that swings open on external hinges, giving you full-width access to your truck bed without lifting the entire cap. The door seals against a continuous weatherstrip bulb, and our three-point rotary latch system locks at the top center and both lower corners for even pressure distribution.
Each latch point uses a stainless steel rotating cam that pulls the door tight against the seal. You lock and unlock all three points simultaneously with a single key cylinder, so there’s no fumbling with multiple latches when your hands are full. The cylinder is keyed-alike to your side windows, which means one key operates every access point on the cap.
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LEER 100XL Truck Cap Questions
The 100XL is available for all major full-size and mid-size truck platforms including Ford F-150/F-250/F-350, Chevy Silverado, GMC Sierra, Ram 1500/2500/3500, Toyota Tundra/Tacoma, and Nissan Titan/Frontier. We manufacture the cap in three bed lengths: 5.5-foot, 6.5-foot, and 8-foot configurations.
When you order through an authorized LEER dealer, they’ll verify your exact truck year, make, model, and bed size to ensure correct fitment. The cap is custom-built for your specific vehicle and arrives ready to install with no modifications required.
The 100XL truck cap provides significantly better security than most tonneau covers because it features rigid fiberglass walls, a lockable rear door with three-point latches, and locking side windows. Tonneau covers—even hard folding models—use flexible hinges and perimeter latches that can be pried open with hand tools.
Our three-point rotary latch system locks at the top and both lower corners of the rear door, creating a seal that’s extremely difficult to breach without a key. The side windows also lock independently, so you have multiple secure access points. For contractors, hunters, or anyone hauling valuable gear, a 100XL offers theft protection a tonneau simply can’t match.
The 100XL’s smooth fiberglass roof supports aftermarket crossbar systems designed for truck caps. We offer LEER-branded aluminum crossbars that mount directly to the cap’s internal framework using concealed brackets, so you don’t see exposed hardware on the exterior.
These crossbars support kayaks, cargo boxes, lumber racks, and ladder carriers. The fiberglass shell is reinforced at the mounting points to handle distributed loads up to 200 pounds when properly secured. Your dealer can install crossbars at the time of cap installation or add them later as your needs change.
Every new LEER 100XL is backed by our 3-year limited warranty covering the fiberglass shell, paint finish, and all hardware including latches, hinges, and window frames. The warranty protects against manufacturing defects, finish delamination, and structural issues under normal use conditions.
We also warranty the weatherstripping and seals for one year. If you experience leaks or seal failures within the warranty period, your installing dealer will repair or replace the affected components at no charge. The warranty is transferable if you sell your truck, which helps maintain resale value.
Most authorized LEER dealers complete a 100XL installation in 60–90 minutes. The process includes positioning the cap on your truck bed rails, securing it with aluminum clamps, adjusting all latches and windows for proper alignment, connecting the wiring harness to your truck’s electrical system, and verifying the third brake light and dome light function correctly.
Your installer will also check that the rear door seals evenly and the side windows slide smoothly. We recommend professional installation because proper alignment is critical for weatherproofing and long-term durability. Most dealers offer same-day or next-day installation when you order a 100XL in stock colors.
Yes, the 100XL is a popular choice for truck camping because it creates a secure, weatherproof sleeping area. The interior height is approximately 19–21 inches at the front (depending on your truck model), which accommodates sleeping pads, air mattresses, and low-profile camping setups.
The carpeted headliner and tinted side windows provide privacy and insulation. You can crack the side windows for ventilation on warm nights without compromising security. Many campers add foam mattress toppers or custom sleeping platforms that fit between the wheel wells for comfortable overnight trips.
The 100XL is available in over 200 factory-matched automotive colors to match your truck’s exact paint code. We stock common colors like black, white, silver, and popular OEM shades for Ford, Chevy, Ram, Toyota, and Nissan trucks for faster delivery.
For custom or less common colors, we mix and paint your cap to order, which typically adds 2–4 weeks to production time. Your dealer will provide a paint code chart during ordering, and we’ll send a color sample chip for approval before painting if you’re matching a unique or metallic finish.