I'm now on a road trip with the 1-ton and camper. The weather finally warmed up to 20F so I swapped the 160 t'stat for a 180. NAPA didn't have a non-safetystat so that's what I used. When I got to a warmer area along the Columbia R. I pulled the cardboard from in front of the radiator and now the temp sits right on 180. No drifting down toward 140 on the down hills like with the Robert Shaw 160; and the heater works much better. Temp has been in the 30s today and when pulling even a slight grade the temperature gauge headed toward 212 with the cardboard "winterfront" on. Two weeks ago when it was near zero, even turning the heater on pulled the temperature gauge down, hence the cardboard. Climbing "Cabbage Hill" near Pendelton OR, which is miles and miles of 7% grade, gauge never moved from 180. Ambient temperature was mid 30s. Snowed like mad through the Blue Mountains this evening. Supposed to be better tomorrow.