I know there are numerous ways (and threads) to do this, but this is what I came up with.
Coleman Roadtrip LXE. Took the brass connection from the grill's regulator. The regulator is not needed anymore. Reducing bush 1/4 x 1/8 to connect a Camco Quick Connect plug.
Tee off the existing line AFTER the RV Tank's regulator. This way the grill's regulator isn't needed, plus the pressure in the line to the grill is low.
Had a 15 feet hose made, 1/4 mntp on both ends. Connect one end to the tee, the other end to the quick connect, which you can connect to the grill!
Grill wherever around the coach
PS: Grill works as it should, and no pressure issues using appliances in coach when grilling, or vice versa.