I'm was running the zone 5" kit on my 15 Sierra HD. High quality kit for the price with nice welds. Zone is a sister company of bds and some of my parts do have bds engraved on them. But let me warm you, and I'm sure many others will agree, go big the first time. I had my zone kit installed for about 2 months running 35s, then wanted 37s but couldn't clear them without major bumper trimming. So then I ordered cst 8-10" lift. About $6400 on lift alone when all said n done. And like you, I didn't want to go bigger than a 5" kit, I thought I'd be good with just leveling it.....