I've searched for hours and could not find anyone running this setup. Is there anyone out there that has this setup? I found them with the stock 18's and some had to use 1/4" spacers. My friend just gave me some 35x12.5x20 mud grapplers that have about 1/4" of tread left. Do you think I should put them on my truck? Trying to decide if it is worth it or not. I don't have the money to buy new tires right now because work has been slow. Any opinions appreciated.

 

the oe 20's are wider than the 18's and have 6.5'' of bs.....I think you are going to run into some pretty good rubbing especially since those sidewalls are so aggressive.

 

Right. The sidewalls will probably touch the upper control arm/ball joints.