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Sorry, missed the other question.. Looks like 20s with 37s 6" lift.
You should get a level and 1/4" wheel spacers just in case.
IMO
want to stay with a level only and no lift. What is the biggest tire I can get away with without rubbing issues?
I'm thinking 4" lift and 35s. Rims are 20s for sure
Agreed ^^.
OP, check out the Guide to Leveling & Wheel and Tire Sizing linked in my signature for a ton of information on how to level your truck and what you can fit wheel/tire wise. If you have any specific questions after reading that feel free to post them up.