Ideally something with a separate room for the kids to have their toys and sleep without us disturbing them with a radio etc
If you have a decent amount of money to spend then look around lots. Layout is number 1 factor I reckon, after ensuring it’s towable by your car of course.
The fact you are asking for a separate kids’ room suggests you haven’t seen many…
If you are looking to buy new then Bailey Pegasus, Olympus or Orion get my vote due to the way they are made. Also Sterling have good layouts, and Swift are cheaper.
Just go to a dealer and mooch about. Then you can see what’s what, and shop second hand.
For towbars, http://www.towbarexpress.co.uk are ace.