It sounds like your grill is meant to run on 11" orifice pressure so connecting to the RV low side should work. You'll have high fire all the time unless you have another control valve on the grill to cut the orifice pressure down for lower heat. I have a Marshall 2 stage reg that has a pipe nipple between the first stage reg/changeover and the second stage reg and I have 18 psi at that point. I teed in there with a 25' hose and that's enough pressure to operate my grill that has it's own reg so I can still use that reg for the heat control. Craig