I just done this a few weeks ago lol.
Yup, the Jayco quick connects are Proprietary. The only ones I found to fit mine were the Camco fittings...or you can buy the correct one's from a Jayco dealer too. I wanted mine to be easy to find and get in the future, so I converted mine to all Camco.
As Camping Couple said, you'll have to modify the road trip. The regulator on the camper already regulates the propane at 11WC or about .40 psi. That isn't enough to make the regulator function correctly on the grill so it has to be removed. Only problem with removing it is, it is proprietary threads and you can't find a fitting the correct threads at any hardware store. They may be available through Coleman, but I wouldn't bet on it.
My fix for this. Drill and tap the grill fitting to 1/8 NPT female threads. Thread a 1/8 x 2 nipple in it and then the quick connect. Used good pipe thread dope and checked for leaks, worked like a charm.
Grill now works as it should and has the correct flame. I found a 50' Propane and NG rated hose on eBay for a good price...rated for 350psi. I now have to option to place my roadtrip almost anywhere I want.
I also used the grill fittings from another old Coleman camp grill we had to make the mods. For 1 being, if I screwed up I wouldn't be out of anything....And 2, I still have to option to use the grill on the little 1 pound bottles using the factory setup that comes with the grill.