I'm sure there's someone here that has bought 24s for your Denali XL. I've been wanting to get 24s on mine and my wife finally has given me the green light. I found some that I like and is in my price range. But I want to know if I should lower the truck a bit to get rid of the gap? And if so, should I just get a lowering kit or air bags? Will a lowering kit be more of a bumpy ride than the air bags? I still want the ride to be smooth even with the 24s. Anyone have any suggestions? PM me or just reply to this post. Thanks.