I noticed in the diesel pusher we bought it has a 27 gallon propane tank. BUT then I see the thing has 2 furnances, I can't imagine that propane will last very long. But maybe its well insulated, don't know, since it has no slides perhaps. I know the bed platform over the engine did have insulation under it, its now crumbling and it fastens tight. I have purchased dynamat for both noise and heat insulation so know that will help there, I'm going to clean all the old off and put this stuff in. Haven't looked it over yet, but 2 furnaces, got to suck some propane. Has a 10 gallon water heater, electric or gas don't know yet.
I'm thinking I will probably take some electric heaters for in there too. One of them will really putout some heat, those little cheap ones are good and they will turn off if they tip over. Though I won't travel a lot in winter if I do I still want to be warm. I have one for in here but haven't had to use it yet.