Don't forget that if you drive through Slovenia and are <3.5t you will need a vignet. A few years ago we were pulled in for a check and brother in law who was following also stopped. We were ok as 4t but his was <3.5t and hit with €800 fine.
How does that work charlie? A >3.5T doesn't need a vignette but a <3.5T does? I shall investigate.