An observation or opinion - stabilizing jacks are used to stabilize a level trailer to prevent rocking and unwanted motion. They are not intended to prevent a trailer, particularly a trailer on a non level surface, from moving. On my two TMs and I assume on all of them the stabilizer jacks are oriented across the trailer width not along its length. If the jacks are being used to hold the trailer on a hill they will roll under and fail if the trailer moves. Good chocks are your best bet whether they are made by you or someone else. Also if you take the time to level the trailer in your driveway it will be less likely to roll on you.
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