That could be perfect except it's a little too big too heavy! I think we might see "in the future" a Li-ion charger about the size of a shoe box or maybe even twice the size which can be plugged in place of the cigarette lighter and off you go for 10-15 more miles in emergency situation.This one runs my Motorhome just fine..............AND I also use it during power outages
http://www.cabelas.com/product/Champion-Watt-Generator-Weekender-Package/909433.uts