All the stab links do is to connect the stab bar to the lower control arms. Side-to-side movement (body roll) is absorbed by the bushings on the stab bar at the links or on the lower control arm at the links. Therefore, the link does not require to be that beefy.
Up and down motion is about all it will be required to handle.
Could they break with a direct contact with a large rock? Sure, but the rock would also hit the lower control arm first since they are mounted on the inside front of the lower control arm.
Nice thing is if one ever did break, it would not be a tow job. You could drive carefully, until repaired, and cost would not be that expensive, especially since they are easy to replace.
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Black Sheep Hummer Squadron
(ME TOO)
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