I know plenty of people with 6" lift. 12" wide wheels and 37s.
As for the 3" with 20x12s and 33s. I'd say it'll fit mine right now has 20x10s (-24 offset) Basically a 35 and had no rubbing issues everyone said I would. Even installed ranch hand front bumper.
Here is my2013 platinum. Sitting on 3" RCX stage 2. With 2" rear block. RCX dual steering stabilizer 295/55/20 nitto trail grapplers. 20x10 AE series 016. Ranch hand front replacement.
3-3-14 all coming off after 4000 miles. Going 6" fabtech with 37 nitto mud grapplers. On 20x12s. Soon to...