Check Mud as there are some good threads on the rear sway bar situation including using the 80 Series extended options (used to be some on the market from MAF). I'm running the stock sway system (new bushings) and get very minimal interference at full flex, not enough I've done any changes to it. We might have an extended swaybar options from another model that could work (60 Series for example), I'll have to peak at it after the holidays.