In reply to gingerwolf:
Being a T4 owner and constantly using it for dossing down when climbing, I'd say don't go for a car. Van is much less hassle, you're less likely to get knocked up by the police and there's less windows to have to block up. Also, in general there's more space in the back (even if essentially the same chassis as a car model) due to lack of upholstery/folded seats, which means more gear space, and also less worrying about stuff chucked in the back in the back causing damage.
Having said this be mindful of the following if buying a van:
-your speed limits are lower on many roads
-many toll bridge and ferry costs will be higher
-fuel consumption is generally less (but not always)
-obviously you don't have the flexibility of rear seats
-if you're anything like me, you'll wait ages to get some decent crates in the back and spend years cursing as your shopping either flies around the front or back of the van due to less handy compartmentalised space
For these reasons, it may be worth going for a small people carrier or similar, but you'll possibly end up removing seats and having to fashion curtains (look for a van that looks right and there's probably a car version).
As for driving fun, if you go big, you get the different sensation of grandeur/power, or just get a VW caddy and map it up to 150+ bhp
I have a T4 Syncro, it's 4WD, does 35 mpg, and has a very basic raised floor/bed arrangement which is removed in minutes, but allows me to keep a mattress etc. set up on top and all the gear I'd ever need underneath (avoiding the nightly shuffle of stuff backwards and forward from eh front to the back to make space). I've spent many-a-night pulled up either at a crag, or on a random back-road to/from climbing trips. It beats a tent every time.