I have done the same thing, though I was lucky that the camper didn't axtually come off the pin. I felt a giggle and had the sense (better late than never) to strop and check.
Some red paint is a good idea. I wrote to VC a while back and suggested a different change, that they change the "TOP" sticker and put something like "TURNOVER" on the lower side of the hitch, as once it's flipped you can't see the "TOP" sticker.
Twin chains, crossed and hitched a length that allowd unrestricted turning but not allowing the hitch to hit the road is a good idea.