I'd like to visit Northern Norway in June and am considering renting a campervan. We've done this elsewhere and given the high cost of hotels and eating out in Norway I'm wondering if its a good option? I was thinking of flying to Tromso then either heading North or to the Lofoten Islands. Are there camp sites and whats the situation regarding stopping in lay-by's, by the roadside etc?. Any advice appreciated.

There are many campsites, and you can also find informal places to stop, though a degree of responsibility should be exercised. There are very many campervan touring in Norway in summer, but a large fraction have German/Dutch/etc plates.
Obviously I don't know what you were expecting, and what kind of a budget you had in mind, but I think you might find hiring a campervan in northern Norway surprisingly expensive. The way to really save money in Norway is to camp in a tent.
