Do I take it off the truck or leave it on for winter?

Doesn't matter one lick either way. Do whatever is most convenient for you.

I like to drive my truck so the camper will be coming off later this week, and the truck will be driven as much as is practical until the snow flies. Then, it's back in the barn until at least mid-March. The truck has never seen salt and I intend to keep it that way.