I'm so glad to have stumbled upon this discussion as this is something I've been thinking about for a while now.

I would love to see a multi-fuel system RV with hybrid technology. It's true, to really make a usable hybrid system you would need a total redesign from a chassis perspective, but I think it could be done if the demand was there to justify the R&D cost.

My idea was to use possibly use a turbine engine. If you take a look at marine turbine's retrorocket, the jet turbine they outfitted in that pickup can do 800 miles to a tank and the engine can be tuned to burn multiple fuels. Turbines dont do well at variable rpms and operate best @ certain rpms. In an RV installation you can be sure the turbine can spin where its happy driving both the transmission and the electrical system. The beauty of this system is that it's very compact and could be teamed with a traditional engine in the space of today's RV bays. Turbine engine gensets are readily available on ebay and govt surplus sites and are very desirable solutions due to their ability to burn almost any fuel you throw at it. The Rolls Royce Allison 250 MTT use would be a great system as it runs great on biodiesel while producing 300hp at the shaft.

My dream would be to have a roof covered in super efficient solarpanels which would drive a hydrogen generating system to power a fuel cell (which can assist in water and cabin heating) to assist the electrical subsystem, or if you were to have a pair of engines (turbine and traditional) in the engine bay, you could have an unleaded engine modified to burn hydrogen (true you need tons of sun and panels to generate a "tank" of hydrogen, but it would be enough for an emergency backup or something or if your regenerative braking system donated its power to the hydrogen creator (also quite compact) ;)

hey a guy can dream can't he?