Would you like a smoother ride from your Promasters Rear suspension? Well SuperSprings International would like to help you out with that with their SumoSprings Solo airless airbags.
Microcellular urethane one piece unit that replaces the factory bump stop as well as filling the gap the factory unit was leaving. Whats the point? Well they're supposed to improve ride, reduce side to side sway and abolish sudden bottoming out. Most people should actually be able to install the SumoSprings themselves using basic tools.

Microcellular urethane one piece unit that replaces the factory bump stop as well as filling the gap the factory unit was leaving. Whats the point? Well they're supposed to improve ride, reduce side to side sway and abolish sudden bottoming out. Most people should actually be able to install the SumoSprings themselves using basic tools.
Fit them and forget them is the motto, they won,t sag or leak like traditional airbags and there are no compressor lines. There are two choices of density to suit your typical loads, one for medium duty and the other for heavy duty.“With SumoSprings, ProMaster users can upgrade the stock rear suspension without having to send the vehicle to a spring shop,” said Mike Visser, president of SuperSprings International. “That way, there is no wasted time spent shuttling drivers back and forth, and the installation can be done whenever it is most convenient.”