top tips from me for what its worth,
The fancier the van the more stuff to go wrong
Dont forget the cd player!!!!!!
Learn the basics on how to fix one before you set off!!! And get some tools and fluids (Brake/clutch fluid oil etc.)
Get a solar shower, even if its not sunny enough to get it hot you can at least get clean!
Keep a grill handy so you can bbq
Take a big ass tarpaulin so if it hoons it down you can still sorta bodge something together for out the back doors if you need to work on the bike and there is not enough room in the van
Buy cheap tubes, brake pads, tyres, gear cables and couple of dropouts before you go!!! They will always break when your in the most amazing trailhead ever but it happens to be in the arse end of nowhere!
Get a decent first aid kit and make sure you can use it, it will save you hassle of hurting yourself and having to ask for gauze and a sterile pad in an Italian supermarket!
Apart from those essentials dont take loadsa stuff as you wont use it and it will just break/get lost and upset you/get under your feet/you will need to buy another as the one you have doesnt work anymore/or you will find a better one in quecha for half the cost!!!
in terms of places to go I cannot possibly recommend enough getting out your arse out to Slovenia. If the language was not so hard to learn (or me so thick!) I would be out there forever, it is paradise.
I hope you have a great time!
Oh yeah if have the time going on a mini trip before you go to show up what you might be missing is also a good idea.