ditching a vehicle

getting rid of a vehicle in South America


I know a lot of you have probably already done this. I am looking for an easy way to get rid of our truck as close to the end of the road as possible. We are heading to Ushuaia, and want to fly home afterward without the truck. It is going to still be running, but not worth it for me to sell. Is the vahicle stamped into my passport in Argentina and/or Chile? I am willing to write it off if that's the only way for me to leave Chile or Argentina without it, but am really hoping to give it away to a farmer, or someone who can use it. Any advice?