Found a used fifth 235/75R15, so a full size spare is accomplished. I'm getting some "whump" from one of the other ones. I imagine it's cupped from being on the ZJ and sitting stationary for 4 years.

When I can get new tires, it looks like there are plenty of offerings for 30 and 31, and that will be big enough for the lift I am likely going to end up with.