The Heavy-Duty Suspension Upgrade

SumoSprings® Maxim is built for motorhomes and fully loaded trucks — delivering massive, maintenance-free support without air systems.

Why SumoSprings Maxim Outperforms Air Systems

A smarter alternative to air bags and add-a-leaf kits — engineered for reliability and ride comfort.

Large-Diameter Design

Maxim’s oversized spring increases surface area for stable, even load distribution.

No Compressors. No Maintenance.

Eliminates the need for air systems — no airlines, leaks, or fittings to manage.

Smooth Ride Under Heavy Load

Reduces sway and harsh impacts in fully loaded motorhomes, RVs, and fleet vehicles.

Stabilizes and Protects Your Frame

Reduces frame stress and bottom-outs — extending chassis life and reducing fatigue.

Maxim springs handle full-time payloads with progressive compression and wide load contact.

Engineered for Constant Weight. Built to Smooth Every Mile.

SumoSprings Maxim features a large-diameter, closed-cell foam design that compresses under heavy loads — not with air, but with millions of self-contained air pockets inside its proprietary polyurethane material. As the vehicle moves, the spring adapts to road conditions and weight shifts, reducing sway and smoothing out harsh bumps.

Because of its extra surface area, Maxim spreads out impact force more evenly across the chassis, improving comfort and minimizing stress. And since there’s no compressor or airline involved, it’s completely maintenance-free — season after season.

Durability & Construction

Made to Haul Heavy. Built to Last.

Maxim springs are rugged, road-tested, and ready for the long haul.

Constructed from our microcellular polyurethane, SumoSprings Maxim resists cracking, sagging, corrosion, and UV degradation. It’s sealed against moisture and road grime — so it stays strong whether you're driving through mountain passes, coastal salt spray, or desert heat.

Designed to thrive under constant pressure, Maxim holds up where other systems fail. There are no moving parts, no air leaks, and no metal fatigue. It’s the ideal long-term solution for RVs and upfitted commercial vehicles that stay fully loaded day in and day out.

Maxim eliminates failure points and delivers better support — without the bulk or upkeep.

No More Airbags. No More Compromise.

Air systems wear down. Metal overload springs stiffen the ride. SumoSprings Maxim does more — and asks less.

Its closed-cell foam adjusts automatically to the load, compressing progressively to maintain ride height and improve handling. And because Maxim has no airlines or compressors, it doesn’t leak, crack, or require constant maintenance. It's a smarter, stronger replacement that does its job quietly and reliably — mile after mile.

Trust & Adoption

Trusted by RVers, Fleets, and Commercial Builders

Maxim delivers peace of mind on long hauls, heavy routes, and remote trips

Whether you're managing a fleet of upfitted service trucks or crossing the country in a Class A motorhome, SumoSprings Maxim is trusted by professionals and enthusiasts alike. It’s used by commercial vehicle upfitters, RV manufacturers, and mechanics who need reliable, install-and-go solutions that hold up under pressure.

Backed by a lifetime warranty and engineered in the USA, Maxim is built for customers who depend on their suspension every day.

For the Heaviest Loads. On the Longest Roads.

Maxim is made for constant-duty applications that push suspension to the limit.

Use Case Highlights:
✅ Class A RVs on Ford F53 or similar chassis
✅ Commercial trucks with full-time tool loads or heavy upfits
✅ Fleet vehicles under constant payload stress
✅ Delivery and vocational vehicles needing stability without downtime
✅ RV owners wanting a quieter, more confident ride without air systems

If your vehicle is always loaded — not just now and then — SumoSprings Maxim gives you the confidence and comfort you need. It's the easy-to-install, heavy-duty suspension upgrade that protects your frame, improves handling, and delivers air-free dependability for the long haul.