I think El Pelón is right about this... even caveats about anything of value left in our rooms are given, so I suspect
tennster's language applies.
Sometimes, knowing I am not covered either way, I practice a little risk management and choose a Park and Fly at the SFO DoubleTree because it is in a gated lot with an attendant at least some of the time, and select a spot in view of the lobby, as opposed to a room and a free lot adjacent to the local county park lot at the Embassy Suites - I have seen drug deals and drinking at the lot next to the ES.
But these days are a bit risky - your car can be broken in for your goods, entertainment, air bag - and even your catalytic converter is at risk of theft. If your auto or homeowner policies cover the theft, you have to decide whether to file a claim (and risk unfavorable treatment at renewal time.)
(Mejor pelón que pelado...
)