We went “out of season” in April had the place to ourselves - many campsites were shut but there are so many other places to stop it made no difference! Weather was great (most days but that’s Norway!) Wet on west coast, very cold up north (-25c for a few nights when up high) most of the time sunshine and blue skys!
We like the van, but a luxury night or two in a real bed with a bath is also part of our ideal routine! Airbnb in April in north Norway was amazing £50 a night in a stunning cabin by a huge lake with free wood for log fire!
The very useful website
https://www.vegvesen.no/ is an absolute must. It has tells you if roads are closed and when they will reopen. It also has traffic cameras from all over Norway.
We did not know about it when we started out. We got stuck up a mountain for two days as the road ahead and behind was closed due to drifting snow!
Also signed up for
https://www.epass24.com/ and added on a ferry pass this pays for your road tolls (if 3.5tons or less). I think you get a fine if you don’t sign up to something like this. In a month we got charged about £140.
It’s great we are going back next spring!