There was a case in my state where a land owner accosted two hunters who were trespassing without permission. The landowner killed one of the hunters, and was shot in self defense by the surviving hunter, who was not charged. Some trespassers are class A jackwagons. Some are just ignorant or mistaken. Keep the moral and legal high ground.
Trespassing: when you enter someone else's property, you are trespassing. You trespass when you walk through the front door of a store to buy something during business hours. When the mail carrier walks up my front walk to deliver my copy of Ammo & Blamo he is trespassing.
Illegal trespassing: trespassing when you are not allowed to, either because the land is posted, a structure is secured, or you have been notified (persona non grata) that you are not welcome.
One reason booby traps will get you in trouble is there are people who have legitimate and legal reason to trespass. If the fire department responded to protect your property, or a police officer showed up to arrest illegal trespassers, and that emergency responder stepped on a punji stake, you would be wrong to have put it there. Booby traps are like shots fired at random. You are responsible.
Law regarding impounding vehicles varies from state to state. Find out what applies where you live, so you can have the offending rig hooked and hauled as fast as possible, and stay on the right side of the law.
If you reasonably believe trespassers are committing some other crime (poaching, providing alcohol to minors, destruction of property, illegal burning) and report that to police, they may respond faster.
Where you store your farm equipment or building materials is your business, as long as it is on your property.