Stop the shaking!

Well two of us in this thread alone (Lawrosa and I) and IIRC at least one other report the same level of stability with you being the only one AFAIK that wasn't able to achieve the same results so I'm incline to believe you did something different that what we have done and are recommending here. What amounts of wt did you put on the screw jacks and how did you determine that wt?? I reported what levels I found to be required and can't remember you ever reporting what wts. you found not sufficient or not satisfactory so can you give me a link to the post here where you reported that level of detail since I think I would have definitely commented on it and you are the first AKAIK besides me that have ever even measured these forces so I'm very interested on how you determined these and the details of that experiment.

Larry

Supply you with a link ?? Now that is funny. You know there is no link.
My finding were by trial and error. Just like others have.
Just snug the jacks and turn the crank on the jacks screws a half turn at a time and check the results. At some point the trailer began raise on the suspension and the scissor jack thread became to hard to turn. The 4 jacks never did become steady. These scissor jack were for stabilizing.

Lots of folks report the same thing I found with their scissor jacks on this and other trailering websites so I'm not the only RVer who finds the scissor jacks not up to the job.

The OP can find/buy/barrow a set of scales and try using your weights. If it works for him he's good to go. If it doesn't he can try ideas other offer.

Much depends on how much movement each of us finds acceptable. I have Meniere's disease and require zero movement. My units have to be rock solid. Others don't use any jacks and RV movement/wiggle is fine with them.