Kfalls, you may not even have to wait for spring -- those units are pretty well insulated!! Thick foam in the walls and ceiling, fiberglass batting underneath. They say Bend is nice this time of year . . . .
Do you have a weight distribution hitch or a sway bar? With a short wheelbase on the Frontier, you will need one or the other to avoid sway. We had very good luck towing for several years with a Pathfinder, with a similar chassis to the Frontier. (The new Pathfinders are no longer on a truck chassis -- we now have a Tacoma.)
Wow, Klamath Falls -- you are smack dab in the middle of the greatest camping on Earth. Easy drives to Crater Lake, Lassen, the Cascades, Mt. Hood, the coast, the desert -- unlimited.