Place a passport near the driver's license within easy reach. When crossing an international border with a truck, the driver and any passengers must all have passports. Crossing state borders does not require a passport, only a driver's license. Some state borders do not have customs when crossing between the states. Driving a truck across state borders is not a challenge because many state borders are marked with a sign alone and do not require crossing customs.
Drive to the border check station. Show the driver's license and passport to the custom's officials. Officials might ask for vehicle registration. Tell the officials about all the items carried in the truck. They will always ask whether you are carrying fruits or vegetables as a precaution against spreading diseases. There are usually not problems with having a single piece of fruit, such as an apple or orange, which is in the front and being eaten, but transporting large amounts of fruits and vegetables is usually not appropriate due to the potential of spreading diseases. There are strict rules for transportation of foods like fruits and vegetables and usually only commercial businesses will transport fresh foods across borders.
Fill out claims paperwork. Custom's officials will have claims paperwork which asks you to identify all objects carried in the truck. In personal vehicles, claims are typically minimal. If taking a rental or other similar moving-type truck, items like furniture or personal goods are claimed on the paperwork.
Drive to the other side of the border. Fill out the paperwork requested from custom's officials of the state or country you are entering --- it will be similar to paperwork required from what was required from the jurisdiction you are leaving. Paperwork is similar and generally inquires about items in the truck. Show licenses and passports to the officials on the other side of the border.
Allow officials to search the vehicle if requested. Vehicle searches are more common for a large truck due to the size than for small family cars. While customs officials do not typically search every vehicle, larger vehicles are more likely to raise suspicions. Remaining courteous and cooperating with the officials will minimize suspicion, but there are no methods to prevent searches.