Thanks again for all the great feedback Fixed.
Being this is our first TT, we're starting out with something which we can see how much/little we enjoy it. Really it's our biggest reason for buying used. Most of your points have been considered however it's good to see some real life use numbers surrounding water and gas.
We're concentrating on a Rockwood Roo 25RS right now as we like the separate beds for the kids, the hard shell surround and reading many reviews out there, it seems as though it's been a great trailer for many.
Again, thanks for all the help!