Tried the checks, tried the king pin tri pod, tried the extra crank down jacks. Then I found these cross stabilizer bars based out of California that cross the trailer. Nothing is perfect, but if I forget to lock the barS during setup DW let's me know pretty quick. It is called Steadyfast, google it and check out th video. I was sceptical until I put them on mine then slept in my inlaws the next weekend and couldn't sleep for the rocking. Like I said nothing is perfect but these make a big difference.