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When shopping for a Class A motorhome, one of the biggest differences between gas and diesel models is the suspension system. Diesel pushers typically use air suspension, while gas-powered Class A RVs rely on leaf springs. But which one is better, and can you upgrade from one to the other?
How Air Suspension Works
Air suspension uses air bags instead of steel springs to absorb bumps and provide a smoother ride. Many diesel pushers also have automatic leveling, which keeps the RV balanced even when parked on uneven surfaces.
How Leaf Spring Suspension Works
Leaf springs are made of stacked metal strips that flex to absorb bumps. They’re simpler, cheaper, and more common in gas-powered RVs, but they don’t provide the same level of ride comfort.
Pros and Cons of Each System
| Feature | Air Suspension | Leaf Springs |
|---|---|---|
| Ride Quality | Smoother, better shock absorption | Stiffer, more road vibration |
| Handling | More stable, reduces sway | More body roll and bounce |
| Maintenance | Air bags and compressors need servicing | Minimal maintenance |
| Cost | More expensive | Lower upfront cost |
Can You Upgrade a Leaf Spring RV to Air Suspension?
Yes, but it’s expensive and not always practical. Instead, you can improve ride quality on a leaf spring suspension with these upgrades:
- Koni FSD or Bilstein Shocks: Reduce bounce and smooth out the ride.
- Roadmaster Anti-Sway Bars: Help control body roll and improve stability.
- SumoSprings or Timbrens: Provide extra cushioning between the springs and frame.
Final Thoughts
Air suspension provides a better ride, but leaf springs can be improved with the right upgrades. If you already own a gas-powered Class A with leaf springs, suspension mods can help reduce bounce, sway, and rough road feel without the cost of a full air suspension conversion.
