This was my first time using Dyrt and accessing BLM/public land. The campgrounds at Black Canyon OTG were packed and hotels in the area were outrageously priced (2-star hotel for $200). I got in at around 7/8pm. I slept in my car and enjoyed it! You can totally car/tent camp or RV it; whatever. Just respect the land. The roads further in are "fun". My stock-wheeled SUV did ok on them but if you have a trailer, it might be hard to turn around. If you're low-to-the-ground car, don't bother going back there. All-terrainers will be fine. Some sites look like they're made for one, but you can probably squeeze in 2 or 3 for anyone traveling as a group. Megafauna: I saw deer on my way out. I was fearful of bears but the natl park literature I got later didn't list them. So you're probably good. Obviously, no toilets except at the park.

Verizon LTE unstable 1-2 bars. So close to the park that you can get there early and beat the crowds.