I submit that the Author was off-base to describe a Ford F53 (the only gas Class A Chassis currently available) as "straining a bit" for a 38' RV. Every RV builder is using the chassis for their RV's up to and including the 39 footers.
That includes, TMC, Newmar, Fleetwood, Forest River, Winnie...etc.
That chassis has 6 GVWR's and 9 wheelbases, offering 320HP in the 6.8L V10, and coming in 2016, will have the 6speed TorqShift transmission currently used in the Super Duty truck line:
2016 Ford Stripped Chassis F-53 Motorhome | See All The Stripped Chassis F-53 Motorhome Highlights | Ford.com
These chassis' have a GCWR of 30,000lb and haul these Class A's around with little problem.
In fairness, it should be understood that driving these RV's is not like driving a Diesel Pusher with a 9- plus liter engine. The engine WILL rev up to over 4,000RPM to climb steep hills. They will roll down the freeway at normal speeds like 70-75, but will turn over 1,500RPM. These points are normal and the engines are designed to do it.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV