When you're looking at used trucks, one of the first things you should find out is how many kilometers it has logged. High mileage isn't necessarily an indicator that a truck is in bad condition. Trucks that were used primarily for freeway driving could still be in great condition even if they have lots of distance logged, as freeway driving is much easier on a vehicle than off-roading or stop-and-go traffic.
Look for any damage to the engine and body and always check the steering components, brakes, U-joints, and drive shaft. It's not uncommon for vehicles to develop a bit of rust on the frame, axles, or springs, but if you are able to poke a hole through the metal anywhere, this indicates structural rust and you should not purchase the vehicle. Find out as much about the truck's history as possible such as accidents or repairs that have been performed on it.
When shopping for used trucks, it is important that you find a vehicle that fits your needs and is in great condition. Find out as much about the vehicle as you can by looking for damages and asking lots of questions about the truck's history.