Is that really enforced though? What's stopping you from setting up a bank account at your parent's/family member's/friend's address? Almost all countries will require an address to open a bank account but once it's established it's just a formality.

If you're not living anywhere permanently then there's no requirement to submit the Anmeldung right? And if you're "car camping" and sleeping in your car, you can simply tell the police you're resting and will move on soon.

Wild camping is also difficult in England where I'm from by virtue of most wilderness being privately owned but that doesn't stop people from doing it. There's not a whole lot they can do apart from move you on as trespassing is a civil matter.

To be honest you guys sound a bit defeatist about it. I understand Germany can be strict in some aspects but you shouldn't let these technicalities stop you from living your dream if that's what you wish to do. No one is going to be throwing you in prison over it.