You'll probably need spacers more then a lift kit. I dont have a 2500, only a 1500 and no lift kit and they rub at full steering lock. I dont think a lift kit would solve that, most likely spacers would.
Heres a pic of my truck to give you an idea, I have a feeling if i put spacers on i would be fine. If I went straight lift, I'd probably have use atleast a 4inch lift