Went from an 03 Itasca Suncriuser on a Workhorse chassis (35 ft.)to an 08 Tiffin ( 37ft) on a Fred chassis. It was a positive change, certainly not a diesel pusher, but much better power and drivability. Milage went from 6.5/7 mpg in the Itasca to 9.5/10 mpg with the Tiffin, both hand calculated over 30 thousand miles driven in each.
A little noisier than the workhorse chassis was, but their are several threads on quieting them down without breaking the bank.
Maintainence cost a shade higher than a gas rig, but weigh that against having an effective exhaust brake along with the Cummins diesel/Allison combination.
I would definitely do it again if I was in the market as the complexity of a DP doesn't appeal to me
If you seriously are looking at the Tiffin, depending on year, check it over very carefully for recalls and repair of any factory problems.
