The same difficulty of anonymity arises with the RV itself, a very ostentatious vehicle that not only can be traced with ease, it can be tracked retroactively on virtually every street, every highway, etc.
Regardless, for all we know the person isn't concerned with being caught (and may currently be deceased given that possible human remains have been found).
Regardless, for all we know the person isn't concerned with being caught (and may currently be deceased given that possible human remains have been found).