Some chucking problems are from too light of a pin weight. If you don't carry water with you, try filling up the tank as it may help(depending on where the actual tank is in the frame). Doesn't hurt anything and only takes a few minutes to try. My camping buddy just bought a new Wildcat and had the same problem. Added water and made it much better. He has since drained it, but rearranged some stuff in the nose to help.
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'