I have used Caravans, Suburbans, full-size vans, and a Toyota Previa (very nice) but now use a Ford Aerostar extended van. It hold everything easily even when I leave four seats. 22 mpg. It only has 181,000 miles now, so it's just getting well-trained.
They quit making them in 97 so when this one dies I'll have to make a change.
One of my friends used a little Chrysler PT Cruiser and removed the back seat as Jose mentioned.
DonM