I have had this same idea. I think hybrids make all the sense in the world in an RV application because it would eliminate the need to run a noisy generator when camped and in need of AC.
If that old beemer could get the vixen to 30 mpg, imagine what the same rig with a tdi 6 speed or dsg auto could get if you put a nice boat tail on it. The vixen is very clean aerodynamically up front, but, it is flat as a board at the stern. I would guess that such a vehicle could get to 35mpg, maybe a little better if hypermiled.
Another nice one would be a newer Rialta with the fwd VW chassis. Why in the hell they never put the TDI in this ecapes me. There is also the Lesharo. It came with a renault TD, but, it was a turd in that application. Some repower them with chrysler V-6 fwd successfully.
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