Thanks for the welcomes everyone.
Our eldest is 22, she has moved out and the 17yo is already not willing to come camping with us any more locally but we make him come on big family holidays!
Soft floor is for us at this stage, the youngest still have a few more years left before they are too embarrassed to be around mum and dad and they sometimes like to bring friends.
We do have other tents and things they can use if they wish and at times they prefer to be in their own tent rather than in the main family one.
We also like the ability to set up an awning or extra room or two for our own space when we are staying at one place for longer periods so I think a soft floor is the only way we will achieve that.
We are hoping to find a well made second hand camper that has pretty good offroad ability for around 6k or so. It doesnt have to have many mod cons id prefer to mod it myself but I guess we will just see what happens at the time.