I am setting up to go 30's. Mine is the 2 door. I have the MMA lift & S3 HD front springs already, on 28's currently. Two other adds I will do is 1 1/2" forward front a-arms and 1.25" spacers all around. Extra clearance is good. Rubbing tires is not. A little extra width is helpful too.
I already have a Gilomen tune and their clutching set-up. 100HP! I think it has the power, I hope 30's aren't too much (100 hp Rzr's run 30's all the time).
Its easy to understand
visually 32's on a crew cab. The big vehicles swallow up tires - even 30's dont look so big.
RJ is right, check the weight of tires. Dennis Kirk has weights listed for most tires.
I would add high angle cv/axles with the bigger lift if I did it, just for insurance, but thats just me.