They should be not be allowed to call these things stabilizers. Pfft... Watch them while someone walks in and out of your TT and see how much they flex.
They are inherently weak and no matter what they just don't stabilize that well. If you have annoying bounce, the only thing you can do is to add more stabilization to your stabilizers. You can use bottle jacks or aluminum screw jacks under the frame in four corners or try something like the BAL lock-arm stabilizers (or other brand). Adding bottle jacks ahead of the axles can help too.
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