Just a FYI, don't put batteries and propane bottles in same enclosure. if there would be a spark, you could have a fire.
propane should be vented but not with a fan unless explosion proof. (an explosion proof fan costs a lot more than $375!!)
just something to think about.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.