I have a 2026 ZR2 Duramax. New to GM, coming from Rams mostly. I want to add about an inch of rake for towing in the rear and then add an inch or so to the front to possibly run 35s on a -18 offset or 37s on a +1 offset. How many turns on the keys would suffice? Would I need shock extenders in the front and in the rear? If so, what do you recommend? Thanks.