I'm lifting my '15 2500HD duramax LTZ w/z71 pkg. Can't decide between Zone 5" lift or rough country 7.5". Not compromising w/ BDS 6" bc it's about 1k more than I can spend. New shoes are gonna be 35x12.5 20s. I am not a fan of a bunch of empty fender space either. What I'm looking for is which one gives the best ride, least stress on the truck, and doesn't have that empty space. Any arguments for or against? If anyone has tried either of these lifts, what do you like/not like about it? Thanks