Timbren TR7UP RV Trailer SES Suspension Enhancement Kit for Spring Over Axle Suspensions

The Timbren TR7UP SES (Suspension Enhancement System) Kit is engineered specifically for RV trailers equipped with a spring over axle (overslung) suspension setup. Designed to work alongside your existing factory suspension, this bolt-on upgrade effectively eliminates squat, sway, and roll for a safer, more controlled towing experience.

At the heart of this kit are Timbren's patented Aeon® hollow rubber springs, made from 100% natural rubber with a progressive spring rate — the harder you load them, the harder they push back. When the trailer is unloaded, the springs sit approximately 1 inch above the axle so your unloaded ride quality remains completely unaffected. They only engage when weight is applied, automatically adjusting to the load without any manual intervention.

Key Features:

• Rated capacity: 7,000 lbs.
• Kit height: 7.5 inches
• Fits RV trailers with overslung (spring over axle) suspension and a tie-plate width of less than 3.25 inches
• Patented Aeon® hollow rubber springs deliver a progressive spring rate for automatic load adjustment
• Eliminates trailer squat, sway, and roll under load
• Cushions road shock from bumps and dips
• Zero post-installation maintenance required — no air lines, no pumps
• Installs in under 30 minutes with basic hand tools
• Backed by a lifetime warranty

What's Included:

• 2 x Patented Aeon® SES hollow rubber springs
• 4 x Spacers for correct ride height adjustment
• 2 x Overslung mounting systems
• All necessary hardware

Important Note: Adding this suspension upgrade increases the spring rate but does not increase the trailer's Gross Trailer Weight (GTW). Always ensure the load does not exceed the GTW established by the trailer manufacturer. A custom kit is required for tie-plate widths over 3.75 inches up to 6 inches.