Propane Generators

I have a built in Honda that runs on propane on my 5er. It works fine for short runs (microwave dinner) but uses a ton of propane during extended use - running the AC to cool the coach down, charging batteries. Mine uses enough propane that this weekend when I will do an extended boondocking trip, I will bring my portable Yamaha 2000 to charge the batteries if needed.

As was stated, propane is less efficient than gas, and I would argue is harder to fill. I'm sure there are conversion kits available, but I don't think there is a large market for it.