The Gen 1 plate in 1987 was rated Class I (2000 lb)

BUT that's the plate on its own.
I had a Class II (3500 lb) built for my `87 in 1987, and it had attach points to the frame rails as well using the stock plate.

A Class III (5000 lb) could be used as well, but he truck's engine is probably not too usefal at that weight.

The only "hitch" with hitch design is how well it is attached to the frame of the tow-vehicle. The Class I limit was not the Mitsu truck, but the factory 4-bolt plate on its own.

Don `87 Mitsu 2dr, Rubicon survivor, GModified.