Sumo springs

I had a Workhorse Chassis a few years back. I did just about every suspension upgrade including Sumo springs to improve the ride and handling. The handling improved somewhat............probably 25%, the ride, maybe 15%. I now have a diesel pusher and the ride and handling is 100% better then gas, plus the noise level going up grades is 1000% better. My DP is on a Freightliner and after market upgrades are available. I plan on zero upgrades, why? it rides and drives great as it is. If I had a gas motor home. I might do some sway bars do help with handling, as far as ride, it's been my experience, it's basically money down the drain. I've had two gas motor homes one I just did shock upgrades and again, no difference, the other I talked about above. I've found that quite often when people spend money on an upgrade, that they've convinced themselves into a positive improvement no matter what the outcome, so will talk positive about the product.