30x32 is actually about 4" shorter than the recomended minimum, so if you could manage to squeeze out 4" more of space for the cage, it would be more ideal. A 2 level 30x36 would be better.
If you make 2 levels that are each 30x32, and you have two pigs that get along well, I think you could make it work. The large weighing factor is the actual pigs. I have 3 bonded sows in a 2x5, and they don't utilize half the space, they would get along fine in a 30X36. On the other hand, there is no way any of my boars could get along in a space that small.