I have a 14 silverado ltz z71 and I'm looking to lift it 3.5". I'm debating on running either 18s or 20s with bigger tires. I seen all different sizes of tires that will fit with each wheel without rubbing or cutting. I'm trying to run the biggest tire possible without rubbing or cutting. I was told with 20x9 wheels with a 18mm offset I can only run 285/55/r20 tires. That seems small to me, about an inch bigger then my stock 265s. If that's true do i run 18s so I can get bugger tires then? Help!