Keith, on two previous coaches, I added a second receiver. On my Diplomat, I had a second receiver (8" receiver piece available at Harbor Freight) welded to the underside of the hitch. My brother in law had the opposite issue. He had a second receiver added to the top of the hitch (if there is room). We had a local hitch shop do the welding. He plated both sides.
By adding the receiver, if you have room, you eliminate the extra insert and anti rattle pieces. The second receiver will raise the hitch 4".