Hi Jim,
Since you can't use a weight distribution hitch and don't want to drill through the aluminum frame I recommend attaching the Curt True Course Advanced Bluetooth Trailer Sway Control # C94VV to a board and using some U-bolts to clamp the board to the frame. Once mounted you'll just need to plug your trailer's 7-way cable into it and use the True Course 7-way cable to plug into your Range Rover.
You will not be able to use any sort of friction sway control without drilling into... view full answer...