I had been considering Vitos, or actually the Mercedes V-Class 'car' from which they were derived on the assumption that it wouldn't have had quite so many loads of bricks in the back, especially if I can find a lowish mileage one. V-Classes also have windows all round whereas these would be added to a van conversion unless it was a minibus.
Import doesn't worry me, I've driven Japanese imports since 1998 except for a few years with an AMG Mercedes. With few exceptions, I do all my own servicing and work anyway.
Most of the weekends away are spent at race tracks, so toilets and showers are present, but would like it to have rudimentary cooking facilities. I'm 6' so a bit of length is important to me.
If I'm on my own I currently either sleep in a tent, or if one of the teams I'm shooting has a pit garage, I'll set up a camp bed in their garage. If the forecast is dreadful, then I'll either borrow the works van and set up camp inside there or get a travellodge.
I realise that I can buy a lot of cheap nights in a travellodge for the cost of a camper, these are all things to consider.
I have more time over winter to search / convert, and traditionally prices drop over the winter and perk up in spring.