There is a standard propane quick-connect fitting with ball valve that RVs use. It's pretty straight-forward to install one, and most modern campers come with them.
I went a little further and mounted two of them at a more convenient location.


Remember that this is low-pressure propane, so your appliance needs to match that. Appliance that attach to a small propane bottle are high-pressure devices that have built-in regulators. Many of those have adapters that by-pass the regulator for low-pressure use, but many do not.