6:41 PM: Thanks for the tips. 2nd SW is still closed south of Highland Park Way while that RV fire is investigated. We talked to SFD at the scene; they say no one was hurt.
7:48 PM: The call has closed, so the street should be open again.
ADDED THURSDAY: SFD spokesperson David Cuerpo tells WSB, “Fire investigators ruled the incident as undetermined with an estimated loss of $800. Crews report the fire started within an encampment and extended to an RV and two vehicles. No occupants were present at the time of the incident and no injuries were reported.”