As said above, different set-ups get different results. I have a 2004 Designer 5er, with factory pin box (plain jane Leland AF 7921 ), hitched to a Reese 16K signature series, and get no chucking at all. Just goes to show that sometimes you get a good combination that requires no special (and expensive) equipment. You just have to experiment until you get the desired results.
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.