As far as replacement parts, the coupler and repair parts are discontinued.
The latch locks are not very secure even in the best situations though, instead I suggest multiple low priced options as quantity seems to dissuade would be thefts and encourage them to go elsewhere. Thieves tend to drag the trailer away slowly on the safety chains without hooking it to the ball, if the ball and latch locks can't easily be defeated. A latch lock, a ball lock, wheel chock locks and chains removed or locked to a fixed object all combined would be the way to go if the trailer is completely unattended.
For towing security/safety it would be best to shore up the latch holes so the latch somehow held firmly closed with no play, and can't pop open on the road, so you may want to improve the latch anyway.
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