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You would be able to hit high 12's with good weather on your side if your tune is good. Ive seen similar trucks with less mods bang out low 13's all day. Which cam do you have?
I ran 15.3 in my sierra denali crew cad awd (very simular drivetrain) with 17's and 33's. I only shed my tool box and tail gate, still could have lost maybe another 250lbs