Ours is a 2 berth with end bathroom. It's classed as a 470. ie it's 4.7 metres long.Jeez. Caravans seem to be huge these days! Yours is a decent size but the one at the back looks massive!
The other one in the photo is a 6 berth 655.
Maximum length for a normal van is 7.5 metres. Anything over that length requires a towing vehicle weighing more than 3500kg.