The best thing you can do is Wheel Chocks, and I dont mean the plastic ones. Use the good metal ones that expand between the tires, they will cost you around 100.00 for a pair, but worth it. Your Stab jacks on the rear wont do anything for front to back rock but the wheel chocks I described will. The next thing you need is a King Pin Stabilizer. Those 2 items will help a LOT!!