Where abouts are you? We have a Pennine Pullman which you might be able to borrow - but over in North Norfolk - though plenty of close places to camp here.
we had a pennine pathfinder 600dl.
Randomly just sold it for less then 2.5k.
we have 2 kids, 7 and 4. we gave them the bigger bed and we had the smaller double. we never made up the 3rd double but believe it will be the same size as the smaller double. If it is i would happily say you can fit another 2 kids easily in that bed. or put the kids in the normal beds and sleep on the spare yourself.
We loved ours as we had the toilet in there and the awning doubled the size overall. If we didnt want a caravan we would still have it. Sad to see it go if im honest.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.