LEER 100XL Truck Topper – Premium Fiberglass Cap
The LEER 100XL is our flagship mid-profile fiberglass topper, engineered for drivers who demand both style and substance. Its flush-mount design sits lower than traditional high-rise caps, reducing wind drag and improving fuel economy without sacrificing interior headroom. We built this topper with a one-piece fiberglass shell reinforced at stress points, so it won’t warp or fade after years of highway miles and sun exposure.
Whether you’re hauling gear to the jobsite or loading up for a weekend camping trip, the 100XL keeps everything secure and dry. Factory-matched paint and tinted windows give your truck a factory-installed look, while our continuous weather seal system blocks rain, snow, and road dust at every seam. This is the LEER topper that works as hard as you do.
- One-piece fiberglass construction with UV-resistant gelcoat finish
- Mid-profile height (approx. 30–32 inches) for improved aerodynamics
- Continuous bulb seal weather stripping on all door openings
- Tinted safety-glass side windows and rear barn doors
- Factory paint-match service available for OEM color coordination
Fiberglass Shell Construction & Finish
We mold every 100XL shell in a single piece to eliminate the flex and rattles common in multi-panel designs. The fiberglass layup uses continuous-strand mat and woven roving for tensile strength, then cures with a UV-stable gelcoat that resists chalking and oxidation. Unlike aluminum or ABS plastic caps, fiberglass won’t dent from hail or crack in sub-zero temperatures.
Factory paint matching is handled through our in-house process—send us your truck’s paint code and we’ll spray the topper before delivery. The finish integrates a two-stage urethane clear coat for scratch resistance and long-term gloss retention. Minor scuffs can be buffed out with standard automotive compound, and the gelcoat layer underneath provides built-in color depth that won’t flake or peel.
Aerodynamic Profile & Fuel Efficiency
The 100XL’s mid-height roofline tapers from front to rear, directing airflow over the tailgate instead of creating the parachute effect you get with tall, boxy caps. Independent testing shows that a well-fitted mid-profile topper like the 100XL can reduce highway drag by 12–18 percent compared to driving with an open bed, translating to measurable fuel savings on long hauls.
Our front-slope angle matches the cab rake on most modern trucks, so there’s no abrupt air-barrier at the topper’s leading edge. Roof supports are recessed into the shell to minimize turbulence, and the rear barn doors close flush with the body to prevent air pockets. If you tow a trailer regularly, this streamlined design also reduces the buffeting and crosswind push that taller caps introduce.
Weather Seal System & Water Protection
Every door opening on the 100XL—barn doors, side lift gates, and optional sliding front window—uses a continuous bulb seal made from EPDM rubber. The seal compresses against an aluminum extrusion frame when the door latches, creating a watertight gasket that holds up through car washes and heavy rain. We also run a perimeter bulb seal where the topper meets the truck bed rail, and that seal sits inside a recessed channel to prevent wind lift at highway speeds.
Installation clamps pull the topper down evenly onto the bed rail, so there’s no gap for water to wick through. The rear barn doors latch at three points—top, middle, and bottom—to maintain even pressure across the seal. After five years of use, the EPDM rubber retains its compression set better than foam or vinyl alternatives, so you won’t need to replace gaskets as often.
More LEER Toppers for Every Work & Adventure Style
What people are saying
Common Questions About the LEER 100XL
The 100XL is manufactured in configurations for Ford F-Series, Chevy Silverado, GMC Sierra, Ram 1500–3500, Toyota Tundra and Tacoma, and Nissan Titan and Frontier. We produce versions for 5.5-foot, 6.5-foot, and 8-foot bed lengths. During ordering, provide your truck’s year, make, model, and bed length—our team will confirm fitment and select the correct mounting hardware. If you have an aftermarket bed liner or tonneau rail system, mention that as well so we can adjust clamp heights.
Paint-matching adds approximately 7–10 business days to the standard build time. You’ll need to provide your truck’s manufacturer paint code, which is usually found on a sticker inside the driver’s door jamb. We spray the topper with a two-stage urethane system that matches OEM color and gloss level. Once cured, the finish is ready for installation with no additional prep work required.
Yes, the 100XL roof is reinforced to support aftermarket crossbars and rack systems. The fiberglass shell includes recessed mounting channels that accept most clamp-on rack bases without drilling. Static load capacity is 300 pounds evenly distributed; dynamic load during driving should not exceed 150 pounds. Popular compatible systems include Thule, Yakima, and Rhino-Rack crossbars.
The 100XL uses traditional framed side windows with visible aluminum trim, while the 100XQ features frameless flush-mount glass for a sleeker appearance and larger window area. Both models share the same one-piece fiberglass shell, mid-profile height, and weather seal system. The 100XQ typically costs 10–15 percent more due to the frameless glass upgrade.
Clean the EPDM rubber seals every few months with mild soap and water to remove dirt and road grime. After cleaning, apply a silicone-based protectant spray to keep the rubber supple and prevent cracking. Avoid petroleum-based products, which can degrade EPDM. If a seal becomes compressed or damaged, replacement bulb seal is available through our parts department and installs in the existing aluminum channels without tools.
We back the 100XL with a three-year limited warranty covering defects in materials and workmanship. The fiberglass shell, door frames, hinges, and latches are all covered. Normal wear items like weather seals and paint finish are covered for the first year. If you experience any issues during the warranty period, contact our service team for repair or replacement authorization.
Yes, the front sliding window option can be retrofitted by a LEER-authorized installer. The fiberglass shell is pre-molded with a reinforced opening at the front, so installation involves cutting the gelcoat, inserting the slider frame, and sealing the perimeter. Most installers complete the upgrade in 2–3 hours. Contact us for a list of certified shops in your area.