@Markuson, I use a 12" drop hitch with my trailer, in order to get the ball low enough. They're reversible though - you can flip it up and get a bunch of lift on the shank. If I shortened mine (cut down the 2" receiver length and drilled a new hole for the receiver pin) I can imagine only having about 3-4" of protrusion right at the receiver hitch, with the winch mounted well above the bumper (at least 8", maybe more). So yes, it might scrape, but not like having a winch tray sitting at bumper height.
I would imagine installing something like this before a trip, not during the outing.
I'm not trying to knock the rear winch,
@Taco2Cruiser. Depending on your wheeling style you may very well use it regularly. I'm just thinking about how to get similar utility without giving up the receiver and ability to hook up a trailer.