Too much choice

Google 1. 'VW campervan for sale'....2, 'Motorhomes for sale'.

You can then peruse a vast number of vehicles with every configuration possible.

HTH

You have to think how long you re likely to be away. IMHO a VW camper is fine for a weekend where the site has facilities and its warm weather but with no facilities and middle of winter you would need more. There are some PVC conversions that have water and heating etc.

To be self contained you are likely to need solar panel, refillable gas and maybe 2 batteries, there is  a thread how to survive on non EHU which covers most of that.

Think of the type of use you are likely to want and the layout, go round lots of dealers or a show and have a good look round then narrow down to what you think you will need such as cooker, fixed bed, fridge, loo, garage etc. etc.

Are yo likely to tour a lot for long periods or maybe a week or 2 or just weekends?

BF, both the VW & Ford based campers do have a toilet but it's no different to the 'portapotty' that Tenters have, some have it fitted in but it's no great shakes(sorry, no pun intended) but they will go everywhere a car will go. Personally I think they're great

Like this-

Bit windy and open to the elements there rocky

See if you can get to one of the big vw meets. Busfest, CamperJam etc. There will be loads to look at and lots of traders there. They all do day visiter tickets but camping there is great fun. 

I have seen conversions with small toilet compartments but they were in T31 or LWB transporters. Most people use portable loos and a toilet tent. There's a nifty shower for a T5 but it's external - not very private even with a curtain. 

Our friends do weeks on end in their old T2. Pop up awning, al fresco dining etc. Family of four and occasional friends 

To be fully self contained I would advise on a motorhome. There are various models just under 6m that have clever layouts allowing full showers, fixed beds etc. 

Only you know the layout that suits your needs so visit plenty of dealers and try them out. 

My sister and husband managed to enjoy camping with small VW type vans, taking two boys and a labrador too!  They used to take a good awning, the portaloo went in a compartment in the awning and they used site facilities. Later with a Bongo van and just the two of  them they toured France each summer. They had previously been campers, taking an assortment of tents. Unless you want all your creature comforts and possibly all year round travel small vans are fine. Some of the new VWs etc are very well kitted out, but not all have good heating or insulation. Check out all your options and have fun looking at vans at shows and dealerships.

Have a look at some AutoSleeper panel van conversions, especially older ones like the Symbol. There's quite a choice out there and Caravanfinder might give you some ideas. 

http://www.caravanfinder.co.uk/motorhomes.html

I think Hillside Leisure might do what you want and Bilbos. Both have been making them for years.

http://www.hillsideleisure.co.uk

http://www.bilbos.com/new-used-stock/

yes, a bit will depend on budget, because getting a proper loo (and even a shower) in a van is likely to be in a more modern van....

as TW says, the Symbol has facilities, but its down to you how 'posh' you want them to be. 

personally, i wouldnt be squatting on a 'loo' in a tiny tent in the middle of a field....nor would OH.

we do a bit of off grid camping (and isnt this what a go anywhere campervan/MH is about) so we need a shower and loo.

we are now in a 6.4m van (quite small....) but 5.40m panel vans now have full facilities but inwouldnt to be in it with a family of four.

your right with the title......too much choice?.....

eveything is a compromise......more space, harder to drive and park...

small and easy to park....less facilities, less space to fit in people and their kit (something else to think about)......

good luck.