I have a 2007.5 4X4 with the pro-comp 5'' lift and mx-6 shocks. with toyo mt 35x12.5.20 tires. i really like the height and overall ride quality. (came from a 2001 superduty 12'' lift with leafspring front end and bil 5100s & 42'' Swampers) I have searched this forum and a few others on the use of spacers vs new coils with little luck. would i benefit from purchasing 5'' coils to replace the spacers and maybe upgrading to fox 2.0 shocks? I just want to know if the increased ride quality is worth the extra price. The truck is my daily commuter 100mi/day on the freeway, pully a 10k trailer during riding season and is offroaded on accasion in the glamis sand dunes. thanks for the help. I really wanted the carli system but dont want to spend the money after building a full class 7 race truck. you can get in deep on suspension really quick.