Should be:

*Small-- 19-20' (RoadTrek size)
*Carbon/composite body, Aluminium frame for lowest possible weight
*Flywheel batteries (highest watts per pound vs lithium, etc)
*electric motors on all 4 wheels, regenerative braking
*small/standby hydrogen generator--about 1/4 of maximum power (60mph) demand
*30% Efficient solar roof with pull out solar Awnings (left & right)
*Aerogel insulation throughout vehicle & fridge
*LEDs for All lighting (headlights included)
*heated/composting type toilet with outside removable tray
*double pane low-E glass windows, Aerogel insulated sun roof
*run-flat tires--no spare carried to save space & weight
*all electric appliances

Is it possible? Would you buy one?