my o7 has a 2.5 spacer up front but with my camper it sat "too level" you could say so i bought 3" lift blocks and swapped out the factory 2" blocks and it looks great with the camper and with it off it looks like the factory rack but just taller all the way around, im running 285/70/18 BFG a/t's and i love it! also upgraded rear shocks to rancho rs9000's and it rides a ton better too!!