One of the many flaws with my bug out RV trailer is heating in a crisis. Once the propane and/or shore power is gone, the trailer becomes an icebox. If I were designing from scratch, I would try to come up with another system to heat the rig in addition to LP and electric devices.

I thought it would be neat to create an external firebox with a sealed heat-exchanger to allow you to use wood or other material to create heat as a last ditch alternative. You would need power for a blower, some insulated flexible duct work, a butterfly valve and a splice into your trailer's air duct system.

I would also add a bank of 10 marine batteries, an inverter, solar panels and controller hardware.