[elhigh]

Mother Earth News magazine did this in the 80's. First they reviewed a guy who'd done it with an Opel GT (!?), then they did their own using a Subaru glider and a Lombardini compact diesel. I think they used a serial-hybrid system, so it could roll all-electric for a limited distance or run essentially unlimited with the ICE running.

I found on the Web one fine day, just wandering around, Mr. Sharkey. I'm not sure who this guy is, but he's got a converted Volkswagen Rabbit which is fine for around town, and a pusher trailer made from the front end of a Rabbit Diesel. It's funny, it looks like he's being tailgated. It's a long but fascinating read.