it's illegal to fill if your not ticketed. Our motor home is on propane and when going stateside you really need to plan. out bronco was as well and it only got 200k to a tank. We didn't need a bigger tank, needed a smaller motor. But a cheater will run you about 40. I've had several, never had problems with them. I even have one that is for going straight into the motor for testing purposes. you can aslo get 40lb tanks which are nice.
Towhoe well under way.