Just bought an '03 2500HD w/ D-max/Allison, 2wd.... I'm looking for a good power add-on, a programmer to be exact, for my truck. I don't want an insane amount of power or anything, just a safe, reliable performance enhancer. Can you guys recommend one? ..or maybe let me know which ones I should stay away from. I’d like the ability to change programs on the fly, but it those units aren’t recommended then I’ll be fine with the others. Also… I just slap on a set of 285/75/16 BFG A/Ts (33” tall). The rub a little sometimes on the front valance… is there a good way to lift the HD 2wd’s and inch or two up front?