I have been following the RV that had a fire and was converted to a gas coach.
IMO with the new 6 speed and the Ford V-10 with the lower RPM range it could easily be converted and used as a rear engine pusher. The newer diesels are just as big and run just as hot as a gas engine with the new emissions they are required to meet.
Lets face it there are a lot of front engine F-53 chassis out there that are successful and if the public realizes that it is a gas engine unit and not a diesel in the back it would sell.
I was looking at my 2015 Itasca 37F when I got this idea, please understand I am no engineer nor do I have Winnebago's expertise.
To accommodate a 38' rear gas engine f-53 type chassis, the engine would be moved to the back and lowered a few inches.
A rear radiator would be needed with an oil cooler for engine and transmission.
Power steering and hydraulic brakes could be converted to electric steering and air brakes.
The suspension could be changed to air if necessary or use modified spring system.
Move the generator to the front between the frame rails and the fresh water to the front behind it over the rails.
Relocate the furnace to the right rear of the coach a install a duct to blow the heat down the frame rails to like it does now from the rear.
I know I'm making this sound simpler than it is in reality. But the Itasca SOLIE 38r is a similar floor plan with a rear diesel. The trick is to keep the weight down to what it is now on the 37F.
I hope a few of the manufacturers give their opinion or people that would be interested in buying one if they were produced.