Propane Question

I boondock in early spring in northern MI, with night time temps often in the low 20s, in a popup. The furnace runs a bit less than 50% of the time, which is still too much for the single Group 31 12v battery to last all night, so I supplement it with a Buddy heater. I can make three nights like that on two, 20 lb bottles with some to spare.

In a hard side trailer you should be fine.