I did 2.5 strut spacer and 1" rear blocks. Looks great with just a slight rake. However, if you tow heavy trailers, you'll want to go back to stock rake, so figure 2" blocks in the rear. When I hooked up to my travel trailer after the lift, the rear squatted lower than the front. Also creates a safety issue by shifting weight off of the front tires while towing. I'll be going to a two inch rear block at some point.
