I'll guess at the socket being a leg mount, and the press studs disguising screw holes or similar for a stabilising cross member. But the correct answer is likely to show just how wrong I can be!
This pic taken facing front of motorhome.
I don't think they are fixings for a wheelchair, as the 'top disc' moves a couple of mm, and lifts a small amount.
Standard fit in Ambulances, they pop up slightly used for securing all sorts of things, odd to see them in a motor home though, bit entertaining to remove mine had 36mm back nuts, qed:
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