Timbren FRTT350J SES Severe Service Rear Suspension System – 8,000 lb Load, No Maintenance

Overview

The Timbren FRTT350J SES Severe Service rear suspension system is engineered for trucks that carry heavier center-of-gravity loads, such as truck campers or salt spreaders. Its single convoluted Aeon spring provides robust resistance to weight, helping to reduce squat, sway, and body roll for more confident handling on varied roads.

Sharper control on the road

As your load increases, the system responds with a progressive spring rate that pushes back, helping keep the vehicle level and centered through corners and gusty crosswinds. This can translate into steadier steering and calmer highway dynamics while preserving a comfortable ride when the trailer is empty.

Ride quality when empty

When the bed is unloaded, a small gap between the rubber spring and the frame allows the truck to maintain its usual ride, avoiding an overly stiff feel until you load up again.

No maintenance and tough reliability

• No air bags, hoses, or compressors to worry about
• Zero upkeep after installation and predictable performance in a range of weather conditions

Durable, high capacity

Designed to support up to 8,000 pounds, the system uses a rugged Aeon rubber compound built for long-term performance under extreme weight, temperatures, and road conditions.

Easy DIY installation

Installation reuses factory mounting points with no drilling and no special tools. Most users report they can get hauling within about an hour from home.

Real-world use cases

Ideal for truck campers, equipment haulers, and other top-heavy configurations where stability and predictable handling matter. Results will vary by vehicle, but drivers may experience improved weight distribution and reduced sway during turns or in gusty winds.