I also put in a radiant heater. got a side mount tank from D&B supply and mounted it between the frame under the nose of the trailer. put a 12v fan in the front next to roof to circlate heat back down and workes good. Also have 4 windows its own 12v bat so it don't have to be hooked to the truck. 2 toy hauler couch-beds that fold up 6 inches off wall. and can still fit 5 sleds in a 27ft charmac.