duals

My Sierra Denali is in transit and I've been researching lift kits to run 33" tires. I was wondering if anyone has a 4" - 4.5" lift with 33" tires and how much offset they are running. I already have Bushwacker fender flares so as much negative offset as possible without rubbing is the look I am going for. I was also wondering if anyone has run the BFG KM2 tires. No one around me has them so I'm leaning towards them. Thanks in advance, Adam