We never tried to convert the RV PROVIDED connection for our portable grill. I need the 1lb propane canister for PLAN B heat therefore we always have several 2-packs on hand anyway. One 1lb canister lasts us just fine for the quick over the weekend type camping trips so no big deal using them.
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We went with the portable propane grill to get the unit away from the side of the trailer. Never liked the idea of having the grill up against the wall of the trailer because of the heat and grease from cooking. Also like all of the different grill tops we can have with our Coleman model.
Just what we do...
Roy Ken