LOL,have to agree with Bert.Pretty much everything mentioned here will consume lots of power,not ideal for dry camping.Learn to sleep colder.Biggest thing not mentioned-heat loss.Windows are your enemy, especially one in the overhead bunk.I blocked off the front ones,and insulated them.All other windows have glass inner storm windows.Pillow/foam inserts for the roof vents,held in and sealed with velcro.Inside part of the rooftop A/C removed and sealed.And many other things I have done to my old rig,to be more comfortable in cold weather,which also make it cooler in warmer weather.
