I use the X-chocks and 4 of the cheap stackable screw jacks sold at walmart. The screw jacks go 1 in front and 1 in back of the tandem wheels on each side, under the spring supports. The X-chocks took out about 75% of the wiggle, and the jacks eliminated about another 20%. We can live with the rest easily.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.