1986.5 5spd NA i towed this jetski to and from st louis to lake of the ozarks more times than i could count, and who knows how many times just to the river a few miles away. I also towed it to Nashville, Tenn fully loaded with my huge sub box that took up the whole trunk.
My buddy towed his ski with his 91 1j a few times with a 6puck even. bumper, tow hitch, and trailer are all fine. although it says no more than 250lb tongue weight, and 1,000lb trailer weight. Mainly as it is only a class 1 hitch.
Supra will tow it no problem.
EDIT: i did have to lower the trailer a bit so it wouldnt stick up so high in the back, my car is lowered and it was a pain to get the ski on and off.
And the highly modified ski shown in the pics is for sale...
