[rvman]

I have had the Sumo Trailer Springs on my rig for the last 8500 miles of travels. Noticed a definite improvement in ride. Less body roll in corners and in heavy cross winds. Less chucking on our quality interstates. Each sumo adds 500lbs of carrying capacity at 65% compression. My thinking was exactly like yours. Really felt like the factory should have put 8000lb axles on the 40 footers. My feeling is the Sumos keep the springs from "wrapping" when you hit that inevitable pothole or bridge transition. I do carry an extra spring and a few wet bolts as extra insurance. Also added the shackle brace kits from Mor-ryde to strengthen the frame to shackle connections.