Originally Posted by
rebel1916
2) Enters upon the land or premises of another person or into any part of any vehicle, railroad car, aircraft, or watercraft of another person after receiving, prior to such entry, notice from the owner, rightful occupant, or, upon proper identification, an authorized representative of the owner or rightful occupant that such entry is forbidden; or
Notice from the owner would include a No Trespassing sign.
Makes sense. So if you don't put a no trespassing sign on your car, I can sleep in it as long as you're not trying to drive it somewhere.