Make sure they are load range E atleast, then depends on what you use the truck for.... I would not go bigger than 35 if towing or not regearing. If hwy use a good A/T, if mixed Use, the toyo M/T is awesome in 315/75/16.
I ran 295 75 16's BFG ATs on my F350 dually for 3 years with 2 inch rear spacers. They worked out great and let me go anywhere on and off road, keeping in mind its a cc long bed dually Stock suspension height, just needed the spacers. This setup worked out well for me.
Tires are getting kinda low on tread now so I am making the jump to a set of 37" pro comp AT's with a 6" lift.
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