I have lost beverages out of a cooler on more than one occasion so now certain parks, or parks where you see little punk teens wandering and kind of scoping out things. I put the cooler on the picnic table bench(under the awning) and wrap a chain through the handles and lock it when I am either leaving or going to bed as one time it happened in broad day light middle of the afternoon.
in the past I have lost other trivial items, an axe, lantern, lawn chair, fire wood.cassette tapes (before cd's existed), kids toys, more back when I was tent camping, and a common issue with most of the disappearances was a situation where people are cutting through sites,
so for those who get all worked up when some of us say "we don't want people cutting through our site" some of us have reason beyond just privacy
back in the tent camping days it was different as theres not the same storage availability, some times you go for a walk like when nature calls, and you can't put everything away every time you fart or blink your eyes. and with a tent opened up for the day to air out,,, old canvas tent,,, its a quick easy look around to see no one is on the site, with an RV its a little harder to tell when no one is there (in 5 seconds or less)
another common thread where there has been issues is in parks that have seasonal campers, whether its lowlife trailer trash living in the park for the summer, or the little gangs of teens that that wonder the park till 3 am
yes I was a teen once, and I raised a couple, and they were on the site at 9 pm unless they were at a friends site and with their parents but back by 11pm