WOW looks like folks have been 'feeding' that hole at the back with scraps of ply.
But back to the propane door. Though functional and looks like semi water tight Im not seeing a lot of air-if any exchanging. Cant tell in any of the pictures if theres is a vent in the floor. If there is not, a simple hole thru floor covered in 1/4" wire screen, or one one those lil round pop in vents like for eave/underhouse venting etc. Propane falls but would need another vent. Possibly another hole w/ plastic pipe riser. If box unventilated to outside it can vent inside to camper if box unsealed. Otherwise could reach combustible levels inside box (especially considering what i see as electrical connections?).
