In a 34 footer the Tiffin 32SA has the longest wheelbase (228", thus a short rear overhang) and is the only one on Ford's 24,000 pound chassis. No coach it's size matches it's bones. They have well over 3000 pounds payload.
The 1' shorter 31SA also had the 228" wheelbase and is on the 22,000 pound chassis but the 24,000 pound chassis is an option. A 31SA on the 24,000 chassis is probably the toughest gasser out there.
IMO only Newmar matches the quality of the Tiffin in woodwork and finishing--most others look cheesey in comparison. But Newmar gassers, while of high quality, lack the long wheelbases and often the heavy chassis of the Tiffins. But Newmar makes smaller gassers than Tiffin does so if one wanted a rig smaller than the 32SA I say go Newmar.