No one is stopping you from living the minimalist RV life in LA or SF. You can't do so on the publicly owned streets. Find yourself a privately owned parking spot, either in a surface lot or a residential plot and you'll be in compliance.

My town has a similar ban in place. Plenty of my neighbors own RVs. They park them on a concrete slab poured next to their house, usually under some type of open carport. You could find someone to rent you a space like that.