that's why I make a point once a year to push some grease into the openings on the locks on my trailer and work in in real good and I rub grease on the threads for the tires as well as the spare.
the lock on the receiver is mostly blocked by your truck from getting water blasted by rainy weather but the spare tire one can get water forced into it as you drive in bad weather so that is the one I most worry about.
I hate them twisty things so I get the holder with regular lug nuts on it and then use a chain to go around the frame and through the rim to lock it.
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