When we were shopping, I had it in my head that I wanted a DP chassis that emulated a bus chassis ride.
I have no experience with the Freightliner and Spartan truck chassis that have been adapted to the RV market. They sell a lot of them, so they must be doing something right.
Monaco, Country Coach, Alpine and I think Foretravel each built a chassis dedicated to Motor Homes they manufactured.
I have heard good reviews of the chassis handling of the Alpine with the hydraulic disc brake system.
We have driven the Monaco 10 bag tag axle chassis, and really liked it even though more firm than our rig's chassis.
We bought a rig with a bus chassis, manufactured by Gillig Bus of Hayward, Ca. You would have to buy a mid 90's rig to get that chassis which preceded the proprietary Country Coach chassis. Our rig rides smoothly, but perhaps too softly for some owners
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk