Hi Digz! If your bbq has its own regulator and you would normally use the small screw-on propane cans you can use this tee:
Keep in mind that it goes between the tank valve and the rv's regulator. Then you can use an extension hose to reach your bbq.
I used this set-up and it worked fine... However! Watch out if you remove the hose without burning off what's in it! The propane inside is actually still in liquid form because it's unregulated and it could dangerously dribble out. #iknowfromexperience
2010 Winnebago Aspect 28B