Phil and Cathy,
You can hook up to the right tank with a "T" and a extension hose that has the same fitting on the other end as the little bottle that you use on the Bar-b...
As the fitting comes off the tank you will need to turn on the right tank but you do not have to move the selector valve as it will be in line after your hook up. Make sure that what ever you are connecting it to has it's own regulator, most all bar-b's have them so should not be a problem.
One other word of caution, when cooking under the awning make sure the bedroom window is closed as all the smoke from cooking (burning)
will go into your rig and set off the smoke detector. Spoken from a man of experience.
I have that set up and leave it all connected and the hose rolled up in the tank storage compartment and run it out the bottom when in use.
To add a little confusion I installed an adjustable regulator so that I can also use it on a High Pressure stove that does not have it's own regulator.