There are only two of us and a little dog, but we went for a 4 berth too. We had an Elddis Tornado XL, still on my profile page until I have a photo of the "new" one! We have just sold this and bought another 4 berth, which is a 1992 Elddis Wisp 450 CT, in excellent condition and a "trade sale" from a local dealer. We are just about to try it out for the first time. This one cost us £1,100. The last one cost us £500 4 years ago, and after many enjoyable holidays with it we sold it for more than we bought it for. Can't do that with a new one!
Both of our recent caravans weighed under a tonne fully laden.
When you get sorted with your caravan, then it is time to think about your adventures, when you get out and about and explore with your dog, another type of trailer! Gives a towing ratio of 300%
OK back on topic.