How Big Can I go with BFG KO2s with a 2 inch leveling kit

[okieram22]

I have a 2019 1500 big horn and have R18 rebel wheels with duratrac tires (bought set). Time has come to replace and I am trying to figure out what will fit. I have a 2 inch level on the front from a bilstein 5100 kit, however it doesn’t ride great so I am going to reset the kit to stock height and go with a 2 inch spacer on the front. Anyone have recommendations on the biggest BFG KO2 tire size I can run without rubbing? Current are 33” so looking at 34/35. (Pic is old tires are more worn now)