In reply to Diddy:
I have only had a car broken into once in Scotland and it was while I was out on the hill for the day. A friend left a handbag on the front seat and I think this was the catalyst as they stole this (which had absolutely nothing of any value in it) and left all the expensive outdoor kit on the back seat.
Leave you glove compartment open with nothing inside. Leave your curtains open with absolutely nothing of any value in view. If it looks like you have considered the possibility of a breakin you should be less of a target.
Tbh, I don't think I would worry about about it too much in the N of Scotland, crime is pretty low, I know plenty of people who are still lax about locking their house when they go out.
If looking for somewhere nice, there is loads of wilderness in Glen Affric and to the North around Loch Mullardoch and Loch Monar which are both pretty impressively isolated, you could probably plan a circuit there taking in incredible scenery with 20 or so Munros. If you finish early there or want to spend a few nights in the camper, there are several good days out in Glen Shiel. You can do the 5 sisters of Kintail and if you are fit, you can tack the 3 brothers onto this. There is also the South ridge of Glen Shiel which can give you 9 Munros in a day if that is your bag.
(All of those last single days are a bit nicer if you have a bike you can stash to get back to the van more quickly).