Toy Hauler Spare tyre mount center bolt?

[Base23]

Took the cover off my spare tyre for the first time tonight just to check the tyre pressure and I noticed a long bolt sticking out the spare tyre bracket mount.
Any one know what it is for or what it does?

Front view

Rear view

 

[chartrock]

I had an old type that had a plate go over that bolt and you put a padlock through it to discourage light fingers.