As stated before, the reason the ordinance was overturned was because it's poorly written and very vague. Coastal areas in So Cal experienced a surge in homeless people living in RVs when the economy soured and many people lost their jobs and homes.
Venice Beach in Los Angeles was particularly hit hard when many RV owners set up permanent residence on public streets. You have to keep in mind that these people are not recreational RVers, they are down-and-out people with mostly old and rundown RVs. Complaints from local residents varied from RV dwellers dumping their tanks on the streets to taking up the few parking spots that were available.
Some municipalities have dealt with this problem by banning overnight parking on city streets completely or by targeting oversized vehicles by restricting length, width and height that practically eliminate every type of RV and commercial trucks.
Here's an article from the L.A. Times:
U.S. appeals court overturns L.A. ban on homeless living in vehicles
