Haven't even put my Propex Heater in yet, the big Green one. Had a nice thought though, what if (assuming the ECU relocated) there were two heaters and two propane tanks. That could give you really rapid heat building, and then you could rotate the tanks as one empties before the other. Might be helpful if even caught in a blizzard. 

Then with subwoofers on either end, above the heaters, there could be tools, where maybe the wrenchs might not stay so cold...