"YOU" dont, the debtor does. call the lender.
In most jurisdictions, the answer is no. Usually legal only on private property. (ie: your own or someone elses with permission)
They can come onto your property because you gave them permission when you signed the loan.If it someone elses property that is trespass but after they have the vehicle the point is moot as long as they didn't damage the property.
historians
Yes, it most certainly is. You would be stealing someone elses property. You never legally "own" the auto until it is fully paid for and the lender delivers a clear title to you.
Larceny is stealing someone elses property, so your answer is stealing firearms
That depends on the law of your state.
Propety Damage covers you if you damage someone elses property. Liability covers you in the event of a lawsuit.
One year is the time limit someone can claim property left behind on someone else's property in the state of California. After the one year time period is up, the item is up for grabs.
computer piracy
No. Just Give it back to them if they don't want it sell it.
chuck it off your property