Gas storage for Generators

Well guys, I have a desiel truck. Two 20 lbs tanks of propane in an outside storage box built in the side of the camper for fridge 120v or Propane. stove/oven propane only. hot water propane only. and heat propane only. I don't have solar at the moment but thinking about it one day. The propane can get used up pretty quick if running the heat as well as other units. I have a Honda 2000 in a storage compartment area that it fits in without any other room. At some point I would like to put a small AC on the roof ( that's another question in itself, what small AC would run off a Honda 2000) so I would like to run the gen here and there for micro, toaster, AC and charge the batteries. I have room on the back camper outside possibly on the upper wall other side of the ladder where I was thinking about mounting a portable gas unit. Wanted a more permanent solution so it was always there if needed. I have in the past put a small gas can on a back rack hocked into the 2" receiver. Bungee it to the rack other side of the exhaust pipe. Worked fine but just one more thing to worry about when leaving on a trip.