Exactly right GrahamI'll watch this as Croatia is on our future list.
You can travel down through Germany and Austria toll free to northern Italy and then I believe you can cross the small part of Slovenia toll free too, to get into Croatia.
Wildcamping is illegal in Croatia so be aware of that and don't park up in obvious places, the police will move you on.
No issues wilding but be mindful of your surroundings especially on the coast.
Morning. I’m sitting here just outside Senj overlooking the sunny sea. We’re spending 7 weeks exploring Slovenia and Croatia. Went via Belgium and Luxembourg, then the German romantic route, Salzburg and Ljubljana. I recommend spending some time around Bled and Bohinj. You’ll need vignettes for Austria and Slovenia if using any motorways.