As an alternative you might consider a roll up awning such as those on RVs. Use for shade and light misty rain but roll up when heavier rain is forecast, snow or any winds.

EDIT: Also don't leave up over night or any time it isn't attended, weather can change on a moments notice.

This is the best way. Most people don't realize that propane tanks are sold as pounds of propane capacity, whereas liquid propane is sold as gallons. A gallon of propane weights more than a pound.

And himself and his dog.