If you have a Blue Ox Sway Pro hitch, make sure you are getting the correct link in the slot. Count the individual links from the FREE END of the chain to the ninth one, slide this one in the slot and rotate the latch till it locks.
Some said you are transferring too much weight back to the front wheels, this leads me to think you have the wrong link of chain. Only go to the tenth or eleventh link if you need to put more weight on the front.
Do you have the right bars? They should have three dimples machined in them near the fat end of the bar that would be 1000 lb bars.
Charles