This is the intermediary step. When he hits the brakes it loads the boat and trailer into the hatch. MUCH better than all that backbreaking labor.
There was a thread on here last year about a boat that crashed into the back of a RV, I just see the corollary.
That's gotta be from backwoods South Carolina...around here, everybody has a utility trailer made from the back half of an old pickup, so that picture of that set-up doesn't surprise me.