Most likely you'll have to remove the regulator from the Weber. Also unless the rv dealer supplied you with both pieces of the quick connect, they must be a matched pair, you may have to replace the one that came mounted on the rv.
If you want to keep the Weber intact go to your local lp dealer, not the gas station that sells propane & they should have all the fittings & know how to plumb into the high side.
Danny & Linda
Sold our '13 Thor Redwood 36 FB
Currently RV & truckless