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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Generally speaking the widest tire you should put on most rims shouldn't be more the 4" wider than the rim. So 12.5" would work but that's the max you'd want to go with an 8" wide rim which I think is the stock size, but you also want to check backspacing when going that big too so you're not rubbing the frame.