I have the same problem when backing my boat trailer into the boathouse at the end of the season. My solution was to go to WalMart, buy a solid hitch with a 3" drop, and a 2" ball to go with it. About $16 total investment. When it comes time to back the trailer in, just insert the hitch into the tow vehicle's receiver upside down, so it has a 3" rise, and reverse the ball. No need to tighten the nut more than hand-tight. Works like a charm.
If a 3" rise is too much, causing the rear bumper to scrape as you start up the ramp, try something smaller. You probably don't need more than an inch or two of rise.
I think this is what Trailmanorman suggested, too.
Bill
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