I'm looking to stay completely stock but I'm going to need to change the tires out. Will a LT285/70R17 fit a stock XL SCREW 6.5' bed HD Payload? Specifically I'm looking at the General Grabber A/T 2's. The OD is 32.7" and section width is 11.5". I've read where people are having rubbing with 33"'s. Not if it'll rub here and I'll need to drop to a 265/70/17. Also, would the dealer need to recalibrate? I wouldn't think so for such a small adjustment but thought I better ask.

Lastly, what tire comes with the truck when ordered with the 265/70/17 All Terrain Tires?

 

Do the math assuming your offset is close to the +44 on the 20s

285/65/20 fits with no rub on an all stock wheel/suspension setup