Now that you know, and you have spare 30amp fuses, deliberately run the jack up until it blows the fuse, and then make a mark on the shaft to serve as an indicator for when to turn off the switch.
Ya know, that's just one of those weird trailer issues. The same thing happened to us on one of our early shakedown cruises. Luckily, I remembered having read about it here or may saw it on Youtube. Got a fuse, installed it, crossed fingers, and good to go. So strange that there isn't some sort of built in limiter or even a sticker that says "warning, bla bla bla". This is an issue that appears on this forum constantly.
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