To elaborate on it, it's called a "worm gear" system, where the threaded rod that is operated by the motor and thus moves the pads downard, is floating, so when 1 side reaches tension, it will then shift the actual rod further away from that side to allow the other pad to continue travelling.
Once both pads reach equal (ish) tension, then they will apply pressure to stabilize.
I too was told to just add wood under the low side, and that my jacks were used to do the last bit of levelling on the trailer.
Was told by the sales person, the service guy who set me up, and the service manager.
They were all wrong.
Since then, no one has done much of anything for me, other than hang up the phone or offer me a terrible price on a set of independent stab jacks.
Yay for dealerships who don't give a damn!
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