Why? If for nothing else, it looks better. I always thought the stock 2WD tires made the whole truck look small and, frankly, a little dorky <img src="/forums/images/graemlins/ignore.gif" alt="" /> (in lieu of a harsher word).

I bought my truck second hand and it came with some Enkei wheels (same as H2O_Man's : http://www.athenswater.com/images/TF.jpg ) and 30x9.5 R15 Michelin LTX M/S's. I'm not sure about the tires, but the wheels were part of the "Titan" package that SE Toyota marketed. I think it looks pretty nice, if I do say so my ownself. As far as performance goes, they've handled loads and "loose" conditions well. Only been stuck the once... I don't think I'd go smaller; don't need bigger. Probably be just as happy with steel wheels, though.