Not sure if they still do, but Renegade was keeping the cab suspension on there rigs at the time I test drove one. (Most of the other converters remove the cab air ride) During my test I due recall more bounce than in my present rig, but that was due again to the air suspension on both the chairs and cab in the Renegade. My current conversion only has air seats and the air suspension on the front axle does not move much. I am sure the wheel base was shorter on the Renegade vs. my Show Hauler which is 336" and a shorter wheel base will create a little rougher ride.
I got the opportunity to drive my truck before it was converted and it drove like a truck, I actually was worried that the ride would be way to rough for my wife's liking. When we picked it up from Show Hauler, my wife as well as myself, where blown away at how awesome the ride was.
So I am thinking there must be something that was either miss adjusted or setup improperly.
2003 28' Show Hauler Motorhome on a 1995 FL 120 www.showhauler.com