Promaster SumoSprings Rear Helper Springs

$ 199.99

Promaster rear SumoSprings or helper springs for van and cab chassis, 1500, 2500 and 3500. Great for the Travato, Trend, Zion SRT, or any motor home. Sold in pairs.

The Promaster SumoSprings can help reduce side to side movement, sway, and rocking. No modifications or drilling are needed. They mount using your factory bump stop brackets. Unique double spacer mount included to fine tune your rear suspension. Use one spacer for less engagement or the double spacer for more engagement. The Promaster SumoSprings come in a heavy duty version for heavy cargo and RV use, a medium duty version for light van conversions, medium cargo use, and a light duty version for passenger vans or lightly loaded vehicle . You will see those options at check out.

SumoSprings are a micro cellular urethane product designed to enhance load carrying ability and stabilize sway. They can also help decrease and cushion hard bottoming of the factory springs on vehicles near their weight capacity. These springs are a progressive system that increase load holding capacity as the product compresses. Soft riding with easy installation and no maintenance. They work much like an air bag system, but with thousands of tiny air bubbles that never leak out.  Helps with both jounce and rebound as they absorb energy on compression. Do not exceed GVWR for your vehicle. 


  • Sold in pairs
  • Product capacity is 1000 lbs at 50% compression for the light duty material
  • Product capacity is 1500 lbs at 50% compression for the medium duty material
  • Product capacity is 2800 lbs at 50% compression for the heavy duty material
  • Read all manufacturers recommendations and warnings 
  • All warranties are manufacturers warranties
  • Never Exceed Gross Vehicle Weight Rating