this is the one I'm wondering about, she has a tent hooked to the rv, and a fire/stove type thing in the tent..which I'm wondering if all the heat would go into the rv, so you did'nt have to run anything in the rv...to keep it somewhat warm...I’ve done that. I think -4F was the coldest tent camping I did. Ironically I got face down in my mummy bag on one cold night and got over heated. Couldn’t find the drawstring to loosen the hood. Damn. Talk about a panic attack. I had a -30F rated Cabela’s semi mummy bag and it was cold as heck when I climbed in it.