It is Vallejo and there are lots of homeless hanging around in that mall area/parking lot. But if don't leave stuff visable and lock your car up you may be ok, but you also may not. No one can tell you that for sure.
I don't know about scales but all other planet Fitness locations seem to have them. The parking lot seemed safe to me but I never went late at night. Don't let people make you scared of the Bay Area. Just like any big city, don't leave anything visible in your car and you won't have a problem.
Pretty safe big parking lot lots of ppl and security driving around at all times I havnt seen any scales
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