How to stay warm in cold weather.

We have often camped in cold weather including during snow storms. We have a 26ft TT with front bedroom,rear kitchen and walk through bath. The heater in the trailer works ok,but as soon as the blower stops,the temperature drops quickly. We bought one of those small cube heaters and place that on the floor in the bathroom aimed towards the living room. This way the trailer stays warm between the furnace running. The other thing we do,which can be done even if you don't have electric,is put a 1 gallon pot filled about 3/4 full on the stove top and turn it on high.Once it starts boiling, turn it back to simmer. By adding humidity,it quickly warms up the trailer. We have camped in temperatures as low as 17 below zero and these things work well.