Have Sumo Solos front and rear on our HR 31' and they made a world of difference in the ride and control when passing or being passed by trucks. If we were to upgrade to a new gas moho, the first two things I would do is 5Star tune and Sumo springs. These have made our moho a joy to drive and not the nightmare that it was when we first got it.
Rick and Patty
2006 Holiday Rambler 30PDD,Sani-Con,Sumo Solo Springs,5 Star,Radio Labs,
MagneShade,Progressive Surge Protector,EEZRV TPMS,2009 Jeep Wrangler