Challenger Lifts RJ7.5 Four Post Lift Rolling JackChallenger Lifts RJ7. 5 Four Post Lift Rolling Jack The RJ7. 5 Rolling Jack is a 7,500 lb. capacity and features air hydraulic operation for 4P14series four post automotive lifts. Broaden your service revenue with easy access to brakes and wheels from underneath four post lifts. 7,500 lb. capacity rolling jacks features adjustable width, low vehicle drive over clearance, stackable height extensions with built in storage rack and factory installed and