Well, I got a hookup on permanent electric, not the generator
, so did not get to find out how cold my trailer can get. But I think I'd have been okay. I used only the electric mattress pad at night and it actually got too warm. It would have been a bit colder if I had not had it, but not cold enough to wake me out of a sound sleep.
I used a space heater on the stove to warm the trailer before going to sleep, but did not leave it on overnight (and did not turn both the heated pad and the space heater on at once- I wasn't sure about the electrical
load so didn't want to chance it.) With the pop top down the space heater quickly heats the trailer and I can run the cord over the top drawer to the outlet so that it is pretty safe from dogs. It got to 30 degrees overnight the second night but I was fine with the electric mattress pad. In the morning I turned the heater on to take the chill off.