Umm, you're in the wrong kind of forum, but, because I am a gearhead by nature, heres my input. I had the displeasure of driving cab-overs and used to drive long haul. I was younger back then, so I was able to tolerate it. By their nature, you're riding over the front axle and thats the roughest place to be. In the big truck world, air ride is the way to go. They have air ride cabs, air ride seats, and the tandem axles are air ride. I recall that some of the old Peterbilt COEs had an air ride front suspension.
I believe that GM based Winnebago chassis will have an independent front suspension system, and thats gonna help a lot with ride quality. It would take some effort, but I would look into replacing the front coil springs with air bags. The combination of air bags and IFS should ride really good. Also convert the rear axle from leaf springs to to air bags. This will require a compressor, tanks, lines and adjustment valves. But air ride will be smoother then metal springs. You could also install air ride seats in the cab, if there is room in the cab.