been looking at new fifth wheels. from the small to the overly large. one thing they all have in common is the two tanks. is there a law saying only two per rv? or possible to have three or four of ...
Two cylinders is a convenient balance for the average use. If you want to build an expedition style RV there are no rules that keep you from adding systems to have more propane. If stationary, plenty have the local propane company drop off and connect a 100# cylinder and refill as needed.