Because if you remove it you don't need a lock.BoltLock brand hitch pins and padlocks and tool box handles.
They key to your ignition key so you don't have to have a separate key.
I'm not understanding why the above poster thinks one with a lock cannot be removed and stored like any other.
What's the removal and storage difference between locked or not other than a key and two seconds?
Because if you remove it you don't need a lock.
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Exactly, by not having a lock, there is no temptation to leave the hitch in the receiver. My typical operation is: install hitch, pull trailer, remove hitch and stow under back seat.
Also in rust prone areas, the locking hitch pins can be impossible to remove if left in place for extended periods.
And if the hitch is left sticking out, someone will eventually walk into the damn thing.
Grade 8 bolt and nut/washers
My typical operation is: install hitch, pull trailer, remove hitch and stow under back seat.