Never installed.
"Haul Master" from Harbor Freight.
Can mount on A-frame trailer, or single frame tongue.
I bought it years ago, but then realized that it would be mostly useless for moving the trailer on my gravel driveway.
Tired of it taking up space and if you can make use of it, great - it's yours.

Will not ship.
Lowball offers of less than free will be ignored. :p
I work in the eastern side of Pittsburgh (between the city and Monroeville) so if you want to meet up in that area, we can arrange something.