The propane supply from your camper has already been reduced at your trailer bottles. If you have a regulator on your grill you probably need to remove or bypass it.
We carry a replacement Weber grill and just place it over the tire rim many places use for fire pits. We also carry a
Coghlan's Tri-Pod Grill and Lantern Hanger which is cheap, works as advertised and actually fits back in it's box for storage. Sometimes I'll swap the larger weber grill for the smaller one that comes with it so I can cook 3 racks of ribs at one time.