Too much structure? You sign up, get put in a group and wheel. How is that too much structure?
Waivers, paperwork, inspections, multiple locations, multiple mandatory show times, waiting in lines, etc. All based in/around a campsite with a kid it's more hassle than it's worth in my case. Just personal preference. If I'm doing a group thing like that it's a lot more fun if it's "when people feel like it" and it's not a big hurry. I get this is more of a "challenge" and that's cool, but my offroading style is more about getting outside and relaxing with some wheeling in between.