When do you turn on the heater?

[Capt Kidd]

OK, so we are leaving on a trip to the Rockies in a week and I understand the nights will be cold.

My question is, when you are traveling not just staying in one place, do you leave your heater on, just turned down low while traveling, or do you stop a couple of hours before your next campground to turn it on and have it heat up the 5er before you arrive, or do you wait to get to the campground to turn it on?

We travel with the fridge on can we travel with the heater also? If not why not?

Thanks in advance for your help.