OP - your post says that you leave your heat set at 70 deg during the night. You should put some flannel sheets on the bed along with another blanket and turn the heat down to 60 deg. An electric mattress pad is also a good way to go.
You said you weren't using propane to heat water, therefore you must be using electricity that can handle at least 15 amps. After the water is up to temp, turn the hot water heater off and use some electric heaters. Move it back towards the bedroom at night.
In our MH we have two furnaces. We turn the front down to about 50 at night and the rear one is set at 60. It works great. I'm not familiar with your TT to know if you have two furnaces.
One 1200W electric heater (it oscillates and has a fan) heats the front half of our MH without a problem down to 26 degrees without a problem.
Bill