How do you transport and store your generator gas?

As of right now, I carry a 1 gallon can in my trailer, but if I had to travel with just the camper I would probably put the gas can in the propane compartment where the second propane tank would normally go. It's sealed off from the living quarters, it's vented, and there are flammable materials in there already.

The only good thing about CARB-compliant gas cans is they're fairly well sealed so little to no vapor escapes.