Your best bet is going to be installing some sort of triangulation stabilizers like the JT Strong Arms or SteadyFast. I like the SteadyFast system as it's less bars, easier on the hands, and same (or slightly better) performance. Plus the customer service is out of this world - the owner literally includes his cell number in the instructions.
I posted a Picture here one time of a Windjammer at a Fla campground with (14) additional screw jacks under it,even the slides and they still were not happy with the "Movement"! I told them they needed more support under the Steps ,so they did that also! Youroo!!