Ah, I am beginning to grin in a rather superior way!
I have been looking for a desserte roulante on Leboncoin so I have reason to be just a tiny bit smug.
BTW, do they pronounce the final "e" where you come from, Norman?
I don't know about the Dordogne but where we lived in the Charente, someone would have looked at me nastily and said "dessertE" and I'd have felt just as silly as you did
N'allez pas trop vite - Proust