Looks like you have an adapter then the hitch. Why don't you just get the proper drop hitch. Then the hitch will be much closer to the RV and less chance of dragging.
Looks like you have a 2" drop hitch and the "adapter" drops it another 4". So, if the 2" drop was dragging the trailer, tey a 4 inch drop. If that doesn't work, try a 6" drop.
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