This is the right place for this thread, I also edited the title to hopefully get more response.
Rollbacks, pull a couple of pins, block the trailer tire, pull a couple of arm type of rods, back up with the tow vehicle, the trailer rolls back. Load the car, lock it down, pull forward with the tow vehicle, the trailer slide forward and you lock it down. I've studied my buddies over when we use it, It's basically a platform on a trailer that rides on rollers on a framework. I looked for a couple of hours the other day, found no plans other than what I linked.
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain