Other than AZ before heading north where it was mid 90s I can honestly say the inside of the rig was at 90 once. Most of the time 80-85 nothing that a fan can't handle. Inside battery compartment highest temp was 85, average temp 75-80 during the day. Good thing for a dry heat. ;) There are wheels under these rv's for moving to elevation. Proper positioning helps with afternoon shade from trees. Having to sit in an open field isn't a must for gathering a good charge.Plus only using 150+/-ah isn't much to put back in the battery bank a few hours in the summer.
Should of added evening temps 50-65 nice sleeping.