Start saving. Prices have gone through the roof. We’ve always had one, done the motorhome thing then went back to a VW California. Europe is so much better equipped for vans than the UK. We do everything we can to discourage stays anywhere bar commercial sites. France has the opposite attitude with Aires and other infrastructure for those who just want to rock up.
It’s a big investment and you might not like it. For some the practicalities outweigh the romance so the rent first advise is sound. When I married my wife I’m not sure I signed up for a week in France with her suffering from the trots in our van. But we muddled through ..