ive found the same issues when i researched lifts. i have 2017 with 5.3 and 3.42's and i stayed with a 4in bds lift and 33's. yes, a 6in lift and 35's look a lil better but i heard alot about regearing if you tow alot and fuel milage drops.im very happy with my 4in and 33's. i dont regret it at all. my truck has a lifted look and is still very functional, no HP loss and i can step in the bed easy enuff and my big thing is in the winter i dont have to stretch way out to clean the windsheild. and please dont do a 6in lift with 33"s