Am I able to park my boat and truck there overnight? Seems to be no downtown or embarcadero parking available. Does anyone have a contact number for the ramp

Issac is correct; I don't know if you can sleep in your truck w/boat attached overnight; campers, motorhomes, and people living in their vehicles can't stay here past 10 p.m.

Shelter Island as long as your truck and trailer attached Park in the yellow marked parking areas do not leave your boat trailer alone without the truck attached you will get a ticket or towed and yes you can leave them overnight as long as they're in the yellow spaces