The best options for fiberglass truck caps cater to different buyer needs, from OEM-style replacements to lightweight, weatherproof canopies. This guide highlights five top products tailored for common fiberglass cap users, including Leer, Century, and Peterbilt models. If you want secure latching, easy one-handed use, or a low-profile design, you’ll find a suitable pick here. The summary table below helps compare core attributes at a glance.
| Product | Brand | Best For | |
|---|---|---|---|
| Gordon Glass Co. T-323T Lock Set | Glass Co. | Truck caps using T-handle locks | |
| Technical Precision Peterbilt 379 Cap 36” | Technical Precision Store | Replacement for 1991 Peterbilt 379 fiberglass cap | 36 inch flat top, fiberglass |
| 83515 & 83514 Leer Rotary Latch Pair | Leer OEM | Leer 100 series and 180XL caps | One-handed swivel lock |
| FLATED Fleet CAP56 Inflatable Cap | FLATED Store | Low-profile, no side windows, lightweight | Patented drop-stitch construction |
| Technical Precision Peterbilt 378 Roof Cap | Technical Precision Store | Peterbilt 378 fiberglass roof cap | Roof cap replacement |
Buyer notes: If you need OEM-style compatibility and easy replacement parts, prioritize brands with direct fitment for your model. For lighter-weight or low-profile options, consider non-traditional toppers that preserve interior cargo space. The following sections break down each product’s suitability, with practical pros and limitations to help you decide.
Gordon Glass T-323T Lock Set For Fiberglass Caps
This T-handle lock set is among the most popular choices for fiberglass truck caps and is commonly used by Leer and Century models. Best for buyers seeking keyed-alike security with simple operation, it includes two J327 keys and supports both clockwise and counterclockwise turning. Best for fleets or DIY replacements where standardization matters. Limitations: availability may vary by model year and specific cap configuration.
Technical Precision Peterbilt 379 1991 Cap, 36 Inch
Designed as a direct replacement for the Peterbilt 379 1991 fiberglass flat-top sleeper cap, this 36-inch cap provides a precise fit for older Peterbilt builds. It’s best for owners restoring or maintaining classic Peterbilt fleets where model accuracy is essential. Caution: product data do not confirm additional mounting hardware or compatibility beyond the listed model.
Leer Rotary Latch Pair for 100X Series Caps
These rear door latches are a direct OEM replacement compatible with Leer 100XR, 100XL, 100XQ, 180XL models and related Leer fiberglass tonneau covers. Best for ensuring easy one-hand operation and reliable weather sealing, they’re known for rugged construction. Better for Leer-only applications; not suitable for non-Leer caps without verifying fitment. Limitation: exact fit depends on model year and door type.
FLATED Fleet CAP56 Inflatable Truck Cap
The CAP56 model offers a low-profile, weather-proof canopy with no side windows, boosting cargo privacy. It uses FLATED’s drop-stitch construction to balance strength and weight. Best for buyers prioritizing low visual footprint and quick, tool-less self-installation. Consideration: the inflatable design may affect long-term UV exposure and durability compared with traditional fiberglass toppers.
Technical Precision Peterbilt 378 Fiberglass Roof Cap
Specifically designed as a roof cap replacement for the Peterbilt 378 year 1991 fiberglass roof cap, it provides a straightforward option for restoring or maintaining roof-level cargo protection. Best for Peterbilt 378 restorations, offering a direct fit for the target model. Limitation: data does not confirm compatibility with other Peterbilt models or variations beyond the listed year and cap type.
Buying Guide
Key considerations when choosing a fiberglass truck cap part or accessory include model compatibility, ease of installation, and weather resistance. Considerations to guide your decision:
- Model fitment: Verify exact year, model, and cap type (cab size, flat-top vs. roof cap) to ensure a proper match.
- Operation and security: Decide between keyed locks, rotary latches, and other mechanisms based on how often you access cargo and security needs.
- Material and durability: Fiberglass toppers are common, but some variants (inflatable caps) prioritize weight and portability. Weigh longevity against weight and ease of use.
- Weather sealing: Look for robust seals and rust-resistant hardware for long-term exposure in diverse climates.
- Installation effort: Some parts require professional installation, while others are designed for DIY replacement with standard tools.
FAQ
- What should I verify before buying a fiberglass truck cap part?
- Which feature matters most for security?
- Are low-profile toppers better for urban driving?
- Is an inflatable cap durable for heavy-duty use?
- Can I mix parts from different brands?
- How important is the installation effort?
Confirm model year, cap type, and mounting compatibility. Check included hardware and whether the part is a direct OEM replacement or a cross-compatible option.
Locking mechanisms and latch design influence how easily cargo is protected. Keyed-alike locking sets offer uniform security across multiple access points.
Yes, they reduce wind resistance and visual bulk, but ensure cargo protection remains adequate for your needs.
Inflatable designs save weight and provide quick install/removal, but assess long-term durability and weather tolerance for your environment.
Mixing can be feasible if fitment and mounting points match, but it risks misalignment and leaks. Whenever possible, use parts designed for your cap model.
Very important for time and cost. Choose parts with clear install guides or professional installation options if you lack tools or expertise.