I have early 30s friend with a big motorhome so they're out there. I agree with the idea of seeking out the most kid friendly campgrounds. There has to be younger parents at these. One that strikes me, just as example, here in CA is the Petaluma KOA. There's so many kids I'm probably not going back myself but for you it would be perfect.
Also open yourself up to a broad definition of camping. Some of my camping friends camp in tents. Be flexible that you're not always in full hookup RV park.
Keep your eyes open around the neighborhood...