With a U302 there is good news/bad news.
The good news is, you have enough tractor to handle the weight of a 3240, 3241 or a 3242 three bottom plow. A Cat 1 hitch would work O.K., but if you could find one with a Cat 2 hitch it would work better.
The bad news is, as you may or may not know, your tractor has load OR depth control, but not both. You will need a guage wheel on the plow to do a decent job of plowing.