What electrics have a "big problem with heating" and what are the other vehicles are in the class of "this one, with no insulation"? Also what is your off-road

What electrics have a "big problem with heating" and what are the other vehicles are in the class of "this one, with no insulation"? Also what is your off-road experience, that you can say "you'll cut yourself on the door handles." _citation needed_