The regulator is attached upstream from the gas control knob. You can remove the regulator at the fitting and replace it with a male quick-disconnect. Then, a standard appliance hose will allow you to connect to the trailer. You can get them through Amazon (male fitting on one end, female on the other)
Afterward, you can attach a female quick disconnect to the regulator and then use the Q grill on a propane bottle, as before, I would think. Just have to remove the bracket so everything will fit up.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)