I had the sidekick grill with a QD adaptor connected to a hose which was QD'ed to the trailer fitting.
My TT had the two bottles, the regulator going to the QD fitting. When I replaced the grill I removed the fitting from the sidekick and installed it on the weber, and yes I had to remove the regulator, it works and is hot as I need it.
If you have a class "A" or "C" you may need other fittings that I am not familiar with.
Others mentioned getting a small propane bottle but that defeats the purpose of using your 60-150 pounds of propane you are carrying around. Too bad I didn't take pictures.