You can put whatever size you could imagine on there but the biggest REASONABLE size would be 17's after that there's so much weight to move its stupid to put anything bigger. 15's and 16's are the more common size, keeps tires cheaper and its easier to find a more broad aspect of rims in that size.
Another thing you have to worry about is the offset, if this isn't correct you can bet those rims won't fit right and can cause so major problems. Just do some research before you buy.