just did the 2.5 RC level/lift on my 15 Z71 crew cab. 20x9 fuel wheels with +1 offset and 305/50/20 toyo's. no rub, actually there is room I could have run 305/55's, but I didn't want to mess up the speedo on a truck with 500 miles among other reasons.
install was a breeze, although having someone to help and taking your sweet time made it easy and enjoyable. I can see how rushing could make this install suck.
+1 offset sticks out just enough to look good and have a nice lip. Looking back if I could have found a wheel I like in say -12 I might have gone that route, but -24 was just too much IMO for a daily driver brand new truck although it does look good on some folks setup.