This is basically a rest stop without any facilities: it has separate parking areas for cars, and for trucks/trailers, but no restrooms or other facilities. No signage restricting parking, and it looks like trucks regularly park overnight here.
facilities of
Manastash Ridge
random
8 by 6 by 4.5 feet (2.4 m × 1.8 m × 1.4 m)
snippet of
https://app.ioverlander.com/places/224301-manastash-vista-point
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snippet