Added a one way, load only, winch to this old trailer. Lowered the hitch to level the best as much as possible.
The winch mounts to 3 1/2" carriage bolts with the heads ground down. The bolts are mounted to a 3" thick wood block that mounts to the trailer hitch with the center bolt and an additional bolt on the other end.
Winch works well but I need to build a fold up tail gate/ramp. It works fine if I use the metal ramps from the car trailer.
Works fine off a car battery. Loaded one tractor using the battery from the tow lawn tractor. Still had enough charge to restart the tractor.
This trailer could be a foot long for tractors with a font bumper but even they fit with the rear wheel about 1/2 on the trailer bed. A ramp might fix that too.
Need to get a picture or better still a video of a tractor being loaded.