we wouldnt want the 4 beds, just the size of a 4 berth
There are plenty of big 2 berths. They are usually big so that each side of the seating area is big enough to use as two single beds. It makes it quicker to set up the beds for frosty old people who don't like to get busy on their caravan holidays. The 2 berth we just sold was the same size van (16 foot) as the 4 berth we replaced it with, and that's not cramped.
There are loads of different 4 and 5 berth layouts, not just side dinettes. Check out caravanfinder.co.uk, all their listings have little diagrams of the layout, which makes it really easy to see what's out there and what you might like.
Click here for a selection of layouts. Ok so the prices may not be what you want but it shows you what's available.