As some have said, you can improve it, but not eliminate it. It is a challenge to keep the unit mobile, but stable.
The more jacks, struts, and other gizmos you add, the more setup and take down work there is. And some of the "fixes" like the strong arm strut type have a downside to them.
The Lippert style power jacks have an equal pressure feature that is under appreciated. In stock form it is impossible to rack the frame, as even if you are on soft ground that settles unevenly, the jack legs maintain even pressure. This means an end to sticking or unlatchable doors. The downside to this is that the jacks must be free to move a little in order to keep the pressure even. This results in the movement others speak of. Adding the JT strong arms to the jacks fixes that problem, but then the equal pressure feature is disabled... There is no free lunch. One could install the strong arms and simply not use them when camped on surfaces other than concrete, asphalt etc. This I think is the best approach.
Myself, I am never camped on hard surfaces, and settling is usually a problem. So I just added a set of jacks in the center which helped a lot and called it good.
Bottom line is: You gotta decide for yourself just how stable you want it, and what compromises you are willing to make in achieving that goal
