Help with propane connection to external cooker

I have the Extend-a-stay fitting which is inserted before my onboard regulator. It came with a long hose to hook up a BBQ. I also carry 2 20# propane cylinders in the storage compartments well strapped down so they cannot move. I usually use the portable cylinders so that it's easy to move the BBQ or tabletop stove around and there is no tripping hazard like with the long hose connected to the MH. Lots easier to get a 20# cylinder refilled than breaking camp to get onboard tank refilled.