I just found out it is a 1998 Triton snowmobile trailer.
The previous owner made a cool movable tie down system that circlips in place with threaded blocks that eyelets screw into. The trailer also has two removable dirt bike / cycle front wheel holders, and a self-storing ramp.
At some point it got new tires, but that was a few years back - it appears to have a new spare.
I have no use for it now. Any questions, fire away...
I am going to ask $625.00 o.b.o.