Our 8529IKBS is a little heavier on the couch/refrigerator side. While only slightly, I do start out with that side of the rig just a tiny bit higher BEFORE putting the slides out. With my added bedroom slide on the same side, it then becomes level when both slides are out.
I start out by adding whatever necessary under the tires to achieve what I described above for side to side. Then I chock the wheels with the x-chocks, unhook the truck and get the front of the 5th wheel a tiny bit lower than level with the front jacks. I then run the rear stabilizers down. (Remember, the rear stabilizers are not really designed to lift the camper so they basically just get tight when they hit) Next, I bring the camper back to level with the front jacks which allows you to add just a slight bit more pressure on the rear stabs than they can do on their own. Finally, I snug things up with two crank type, manual stabilizers at the frame by the front wheels which I had from previous campers. Someday I may mount them permanently.
As for rocking, short of the frame mounted, cross brace stabilizers like the JT Strong Arms or equivalent, using the leveling method I described above along with the two manual stabilizers on the frame at the front wheels and the x-chocks, I'm pretty happy with the movement. (or lack of) It's plenty good enough for weekend camping. If I were full timing, I would probably spring for the frame mounted cross brace system.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel
Ford F-Series SCREW 4x4
TST Tire Monitor - Sinemate 3500w Gen.
2016 Nights Camped = 44