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On a camp site only accessible on foot
(lemmy.ca)
Went to a camping in the Laurentians in Québec (Ste-Agathe) and there were those things near some camp sites. The sites are only accessible by footpaths. No car access. And if you bring a bike, you have to walk it up a hill, so I doubt they are bike racks.
My guess is either a seat, something left over from an eagle scout project, or a cooling rack. Somewhere to put your hot pans/utensils to let them cool/serve from without putting them straight on the forest floor.
Like a lot of things in camping though, it's probably whatever you make of it. Improvise and have fun.