I just purchased a 2500 HD with the Duramax deisel. Love the truck but when I went out for a beach cruise I sank quickly. I had to drop the tire pressure down to 25 psi to manage the loose stuff. The stock tires are smooth on the road but useless in the NC surf. Anybody have any tire suggestions? I'd like to keep the stock wheels if possible. Thanks for any and all beach driving advice!