I have not needed to use it to heat the truck while traveling, but I do have it if the need should arise.
I use a Zerosart Little Buddy Cabin heater (120V electric) . These were made for big over the road truck to be installed in sleepers.
(I added the thermostatic control)
Our vehicles that must remain outside in the fire service had these to keep them frost free during the winter. I installed one in my truck for that reason. I can get paged out in the middle of the night and find the interior warm and the windows frost free.
My plan was to use this as an interior heater in a pinch. The little electric heater will run on a 900w generator. I have one of the little 900w Ultimax generators (12"x12") , or a Sportsman 1850W that will work.
Any small electric heater could be used.
I will say that I have use a small catalytic propane heater as a RRT heater and it worked very well.
The heater sat outside the sleeping area in that red enclosure around the window. We did not use it all night. Just early morning to warm up inside before we crawled out of the bags. I would wake up a little early , start it and it would be nice when wife and son woke up. It did offer interior moisture. Lots of it. The electric heater has a drying effect.
I have heard over and over the heating pad or blanket is the way to go. Doesn't take off the edge once you crawl out though.
The heating pad for the mattress is wonderful, I will admit. I like it so much I got one for the home

Very spoiled to crawl into a warm bed. I like the cold air in the bedroom, and a warm bed
