Heavy duty Bal 5K and 7.5 K LBS jacks are no better than any other rated jack period. The Screw attachment washer is the only thing that matters and bal's design is the same as the rest. I've broken Bal stabilizers on my Toyhauler before. Best to get close to level and just take a bit of load off the springs or the washer will fail. I used to have more problems and damage by dragging the darn things going off road.