Well, it seems the only thing we have in common is the aftermarket rear motor mount. After we got it installed, then we got that noise. I suspect it might be the axle or the intermediate shaft. If not that it must be something loose or not torqued on the Subframe. I believe the RMM is part of...
If you have an aftermarket Coolant expansion tank, it might be making contact with the passenger motor mount.
If you do have one, I heard adding spacer washers to raise it slightly will help with clearance.
Do you have an aftermarket expansion tank?
I found an extremely simple solution.
Buy a used map light on eBay with the door switch on it, got mine for $40 shipped.
First, remove the dome light and map light assembly.
Fish a single tap wire through the headliner with a wire hanger, with the tap wire taped to one end, start on the map...