Lawdluvaduck !!! (and other quaint London expressions as used by that well known Cockney, Dick Van Dyke, in Mary Poppins).
Many thanks for your input, it's always handy to get the view of someone who's been there, seen it, done, worn the T-shirt, etc.
After much searching on the internet, I was thinking the E350 would be our best bet, but after your comments as Fagin (from Oliver)would say, "I'm reviewing the situation"
My mates hired the Ford Explorer this year in Florida for 6 of them, but they ended up with some luggage on the seats. As they were only fully loaded between the airport and their lodgings this wasnt too much of an issue. However, as we're travelling from site to site we'll be loaded a lot more and the last thing I want is to sit in discomfort. The daft (or crazy as you would proabably say) thing is that there's conflicting descriptions of the various SUV's and Minivans which have left me a tad confused. I'm tending towards trying an 8 seater minivan and seeing how we go when we load it. Failing that, I'll bring along an old red Double Decker London bus, pick up people en route, charge them a fare and subsidise our travel that way !
Lastly, how much is a Gallon of Petrol (Gas) now. Here in the UK we're paying around £1.02 per litre, which equates to approximately £4.64 per gallon, or over $9 in real money.
Charlie