Frequently Asked Questions About Kenworth T660 Sleeper Roof Accessories

Will these roof accessories fit my specific year Kenworth T660?

Most sleeper roof accessories are designed to fit Kenworth T660 models from 2008-2019. However, minor variations exist between model years, particularly in mounting hole patterns and sleeper cab dimensions. We recommend verifying your truck's exact year and sleeper configuration before ordering. If you're unsure about compatibility, contact us with your VIN number and we can confirm the correct fitment for your specific truck.

How difficult is the installation process, and what tools will I need?

Installation typically requires 2-4 hours depending on the accessory type and your experience level. Most roof fairings and visors require drilling into the cab roof, so you'll need a drill with metal bits, measuring tape, masking tape for marking, and silicone sealant for weatherproofing. Light bars and antennas may require additional wiring through the cab. We strongly recommend having a second person assist with positioning larger items like full roof fairings. Professional installation is advisable if you're uncomfortable drilling into your cab.

What material options are available, and how do they hold up over time?

Roof accessories come in three main materials: fiberglass, ABS plastic, and stainless steel. Fiberglass options offer the best aerodynamics and fuel savings but require more maintenance and can crack from impacts. ABS plastic provides good durability and UV resistance at a lower cost but may fade over time. Stainless steel trim and light bars offer maximum longevity but are heavier and more expensive. Most customers report 5-7 years of service from quality fiberglass and ABS accessories with proper care.

Do roof fairings actually improve fuel economy, and by how much?

Properly installed roof fairings can improve fuel economy by 3-7% at highway speeds, depending on your trailer height and driving conditions. The best results come when the fairing creates a smooth air transition from cab to trailer. Full fairings typically outperform partial fairings or visors. However, if you frequently pull different trailer heights or run bobtail, an adjustable fairing may provide better overall efficiency than a fixed-height option.

Can I install lights or other accessories on top of a roof fairing?

Yes, most roof fairings are designed with mounting provisions for additional accessories like marker lights, chicken lights, or CB antennas. However, drilling into a fairing requires careful planning to avoid compromising its structural integrity or aerodynamic properties. Use marine-grade sealant around all penetrations to prevent water intrusion. Keep in mind that adding accessories to the fairing will increase wind resistance and may slightly reduce the fuel economy benefits.