I think this is a fantastic discussion, food for thought, great replies, etc. But for every suggestion there's a downside (imho). A solar panel I'm thinking could be easily damaged especially on a truck. The generator in back now defeats the truck purpose but a diesel truck would be more efficient. A good generator would extend range (now you have a hybrid) but not all that much and it's now polluting.
My bad downtown example is if someone were visiting here, or driving through and needed a charge. It would be really bad. What would you do...leave it hooked up 3 hours and take a cab somewhere?
Now a small electric car just for daily grocery, doctor, get parts, etc trips usually 40-50 miles max, plug in at home. IF the car was reasonably priced, IF it had a good warranty, IF batteries lasted and IF new ones not expensive and handled well in bad weather I may would consider it.
Of course, providing the power company doesn't start raising rates!