Our fifth wheel (rear kitchen) has all the appliances in the rear; reefer, range, space heater and water heater running off the low pressure 1/2" pipe.
Fortunately, they put a tee instead of an elbow and I extended the pipe to the curb side of the coach and added a quick disconnect.
The grill I had was equipped with a regulator and was too difficult to modify.
We purchased a 2 burner stainless grill which works great off the lower pressure line.
Our local propane dealer was the best help to get the correct parts.
Very knowledgeable.