This article from Motor Manual, June 1962 gives a general overview of the various size vans available. The top photo of the interior of a 25 footer shows an odd sort of seating arrangement to my view. Great amount of spectator seating to watch mum preparing dinner by the look of it
1958 vintage caravan ad for Belvue Caravans.
You can see by the 1962 ad above that the caravans are basically the same, they just look a bit classier with the side stripe.
ourtouringpast.com THE vintage caravan restoration website
and home of The National Caravan Museum.