17” or 20” depends on what you are wanting to primarily do with the truck. Those that vote 17” are correct if off-roading a lot that does give you more sidewall and the ability to air down especially with true bead lock wheels. If however you are a on road primarily and want to take a little sidewall wiggle out of the truck when at speed. Then 20” will take a little sidewall out. You will however have a slightly more ruff of a ride with the 20” wheels. This is all assuming you stay with a 35” tire. I personally have 20” Venomrex VR-602. I like the look and ride. I’m also using Geisers up front and Deaver +3 in the back. Truly it’s personal choice good luck.