I'll chime in.Does anyone use sumo springs or other type of solid rubber type of helpers?? If so, how do you like them, and are they working? Are there down sides? Would you install them again? I like the idea of install and forget. But if they don’t work I’ll go with air bags instead.
I looked at the same but ended up with air bags. Glad I went with the bags give plenty of adjustability between different trailers.
Pulling a 18' low hauler cycle trailer loaded around 7500lb's with 4 men in the cab and bed loaded full under a cover added 30psi to the bags.
With a two place enclosed snowmobile trailer 10psi. Truck just floats down the road with ether now.
I did pull the cycle trailer before adding the bags and new the suspension needed a little help.