I want to go with Procomp 6089 wheels 18x9
and BFG 305/65/18's.
If I order the wheels just using the year and model
truck, will I get the wheels with the stock back spacing? Which I'm guessing with the 9" rims will rub big time?
If so, what back spacing should I order on the wheels using 305/65 tires and not have rubbing OR stick out alot passed fender?

Thanks in advance..

 

I don't know the backspacing on that wheel, but you can find it on Pro COmp's website. I'm 99.9% sure it's less than the OEM backspacing of 5.5 inches. If you can find an 8 or 8.5 inch wide wheel with 5.5 inches of backspacing, you will be fine with that size. I know a lot of people run 325/60-18's on 9 inch wide wheels but that tire is a little shorter and a little wider than the BFG's. You can probably fit the BFG's using a 9 inch wide wheel with 5 or 5.5 inches of BS but that is just a guess.

 

It doesn't work that way. You get the backspacing that the manufacturer designs and builds for that wheel size and lug pattern. For your wheel, that's 4.75" (from Pro-Comp website specs).