Last year we had a cold week and I turned the furnace on for the overnight, by morning the trailer was very cold. Found out the tank I had turned on must have been low on fuel and ran out overnight. Just found this at Sam's for $29 and got 2 new tanks with gauges so will always know how much fuel is there. I have tried the add on ones but there wasn't enough room in the compartment to see them good and these being built on the tank didn't have that problem.
Think about things before you do them make life easier not harder.