hooking up a travel trailer from the trailer's rear

There is no tongue weight at the back of the trailer so it would be hard to get it hooked up to your ball. Get a steerable dolly that goes on your tongue jack and using a board pushing on the bumper of the trailer push the trailer into position with your truck while someone upfront steers it.

We do it all the time in my RV park but we use a bobcat to push on the bumper.