If your motorhome bounces like a dolphin riding the waves every time you hit a bump, you’re dealing with porpoising. It’s one of the most frustrating suspension issues for RV owners, making long drives exhausting and reducing overall control. The good news? You don’t have to just live with it.

What Causes Porpoising in an RV?

Porpoising happens when the front and rear of the RV bounce up and down repeatedly after hitting a bump, like a boat riding through swells. The most common causes include:

• Worn-out shocks: If your shocks are shot, they can’t properly dampen motion, leading to excessive bouncing.
• Soft or overloaded springs: Weak springs or an overloaded front or rear axle can amplify the effect.
• Poor weight distribution: If too much weight is concentrated at one end of the RV, it can throw off balance.
• Road conditions: Expansion joints, dips, and bridges can trigger porpoising, especially if your suspension isn’t up to the task.

Best Fixes for Porpoising

There’s no single fix for porpoising, but these upgrades will significantly reduce it:

• Replace your shocks: The most effective solution. Choose:
  • Bilstein B6 4600 or 5100: Provides firm, controlled damping to keep bouncing in check.
  • Koni FSD: Adjusts to road conditions, softening small bumps while firming up on bigger impacts.
• Install a rear track bar: Reduces side-to-side axle movement, which can contribute to porpoising.
• Check your weight distribution: Ensure cargo is evenly spread to avoid putting excessive load on the front or rear suspension.
• Upgrade sway bars: A stiffer sway bar keeps the chassis more stable, reducing unwanted movement.
• Adjust tire pressure: Running the correct PSI for your RV’s weight can help absorb bumps more effectively.

Final Thoughts

Porpoising makes for a miserable ride, but it’s not something you have to put up with. Start with new shocks, check weight distribution, and consider adding a rear track bar if your RV still bounces too much. A few key suspension upgrades can make all the difference, giving you a smoother, more controlled drive.