I think the majority don't use the king pin stabilizer. Many of us have added the frame mounted stabilizers, such as Ultra-Fab, SteadyFast, et.al. Just about all of us use some type of wheel chocks, though. The frame mounted stabilizers will reduce the rocking and sway, but will not completely eliminate it. For that, you need more than just the two front jacks and rear stabilizers. Now you're looking at something like the 4 or 6 jack Level-Up system, or the four jack Ground Control system. An alternative to them is to use scissor or screw jacks in front of and/or behind the tires to reduce the effect of bounce from the tires and suspension.