For out west it is campground to campground. Maybe because trailers tend to store food as well and tent campers are more used to it? A woman was pulled from a tent in MT a few weeks ago.
Jist got back from Glacier, Yellowstone, keep in mind many of the really cold places are closed most of the year, you will probably see the most cold close to home.
We have had a bunch, we had a Scamp, which weighed almost nothing and was easy to resell. Fiberglass is cool but keep up on gel coat maintenance and they will absolutely leak at the rivets and windows. Solid campers though.
Our others were aluminum, currently have a 2010ish KZ and love it. Got to keep up on caulking and be careful if you buy used. Buy the owner, not the trailer, it is all about maintenance.
Make sure it has electric brakes and you have a controller that works with it
Good luck!