The fitting part in the table spot makes PERFECT sense, for anyone who ever spent holidays on a roulotte - it's to transform the table "zone" in a bed! I find it AMAZING that they include it.
The tables are common ones, used also in the roulottes/trailers, campers, vans...
I don't remember seeing the instructions in mine, but they could have been separated. Though I don't recall seeing them in my recent instructions sorting, I wasn't looking for them, so..