Promaster SumoSprings Rear Helper Springs

Promaster rear SumoSprings or helper springs for van and cab chassis, 1500, 2500 and 3500. Great for the Trend, Zion SRT, or any motorhome.  Great for contractor vans or any loaded Promaster van. Sold in pairs. Adjustable length allows flexibility for fine tuning. Each side will have two 1" spacers which will make the product 6.5 inches or 7.5 inches in length depending on spacers used. This allows you to have the SumoSprings engage more by using both spacers or less by using one. SumoSprings are a micro cellular urethane product designed to help reduce rear-end sag and stabilize sway. They are a progressive spring with a very soft initial engagement. That means that as more weight is added, the harder they get and more they push back, providing support and control when you need it without affecting the factory ride when unloaded.   Easy installation with no leaks and no maintenance. The Promaster SumoSprings mount using the factory bump stop brackets. No modifications or drilling are