I have added both X-chocks and rear stabilizer braces to mine. You can now barely feel any movement when someone is walking around.
Here's links to products similar to what I've purchased, but the braces I installed was just a pair that go side to side in the rear. With a full set of these, the X-brace chocks might not be needed.
https://www.etrailer.com/Wheel-Chock...21-001090.html
https://www.etrailer.com/Camper-Jack.../LC191025.html
Hopefully this helps, and Happy Camping!
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