If you’ve got the “OK” rather than the Mrs being massively keen, i’d try to make camping as comfortable as possible and look at 4 or 5 star sites.
We stayed here last summer:
Bankenhof
Picture postcard German town. Walking distance to the swimming lake. Mountains for walking and cycling. Europa theme park within driving distance as is the Rothaus brewery.
other places we’ve been to include Lake Annecy (France), Foret D’orient (France), Garmish (Germany), Liptovsky Mkulas (Slovakia), Zakopane (Poland).
All were very different and had their own plus points. Kawan Villages in France tend to be good with lots of facilities.
Heading to Eastern Europe, it gets cheaper but less organised. Annecy was especially expensive.
Given the choice again, i’d head back to Eastern Europe as it feels like more of an adventure but Germany is geared up very well for tourism.