San Diego is trying out a software system to recognize "homeless encampments".

They define "encampments" more broadly than you might expect. For instance, they define "vehicles that people are living in" as "encampments". While breaking up an encampment in the usual sense of that word is likely to bring attention from the press, forcing someone who lives in an RV to move it is not big enough to do that, which means they could get away with it without even reproach.

San Francisco went to the absurd length of prohibiting parking an RV in the city. As a result, people who live in houses but own an RV can't leave the RV nearby in order to prepare for a trip.