Stabilizing jacks don't really stabilize much at all

I have four manual stabalizers which work okay for the first day. Then they settle and trailer movement increases. I just tighten them up a bit and that helps. What really helps tremendously is my external home made wheel locks. . What is happening is the trailer roakc front and back slightly. This eliminates that. Just a couple of 4X4 cut at an angle with some threaded rod through the middle tightened down with nuts. Give that a try