Hi All,
I just completed a trailer hitch install by myself, and I found out a big help that is not in the directions, The key inspiration came from a *-Haul video of how they install hitches using a custom jack. I angled the hitch in place with the tail hanging down and then used a car jack to lift the tail up until the hitch pressed flat against the frame. Once I had it in position, the bolt on was easy, I hope this helps someone.

Larry8