tire and wheel size

i'm planning on buying a new set of tires and wheels for my 88 ram 50 soon. i was thinking of 32x11.5in tires on 15 or 16in rims.
my main concern is if they would fit in my wheel wells without rubbing on the fenders or anything. does anybody know the biggest size tires i could fit on my truck without any sort of lift? any tips or info would be much appreciated, thanks!

Without a body lift, I can run 31" tires on my turbo truck. Anything larger and figure on doing a body lift.

This might help.

okay thanks! i had actually just decided on Pro Comp Type 52 rims with Pro Comp All Terrain Tires. 15x8in for the rims and 31x10.5in for the tires. Has anybody had any experience with either of those? Just want to make sure im buying the right stuff