a quick easy fix.....
get (2) nut/bolt/lock washer set-ups... probably need what, just over an inch in length?
I would install w/nut/lock washer to the inside using an open end wrench.
I'm sure you don't take the hitch on-off every day, so that wouldn't be too much of an aggravation, but it would do the trick.
p.s..... you could even get black hardware, so they would barely be noticable...![]()