First off I just want to thank everyone for the replies.
The worst things about these forums is the first thing people want to do is knock you for your idea. They tell you how hard it is, how you can't do it, and what you should do. I was hoping for different from you guys but I guess it's all the same.
For the people who said that a 5,000 dollar is an old truck let me show you a few posts. like this one.
http://www.alamaula.com/buenos-aires/camionetas/fiorino-1-7-diesel-1999-c-aire/13621642
So for 2,800 american, at the blue dollar rate, I can buy that.
What if it breaks down, what about this, what about that.
This is a TRIP, a journey, I expect break downs, I'm a travel author, and I understand the risks, my questions were about paper work, not about risks.
Of course selling it will be hard, that's why I'm going to sell it for half of what I bought it, I've read about the selling process, and I'm not worried about that, I'm worried about the buying.
What am i going to do with all the pesos?! Again, like I have stated several times, I'm not an average idiot american thank god. I have done my research, and I don't need harsh criticism about the fact you don't think I know what I'm doing.
For the pesos I have already lined up a bitcoin transfer to get out of the city, or I will just go into Uruguay and exchange the pesos for US dollars.
And yes! I know the exchange rate is horrible...
But instead of renting a small car for 4,000 grand for four months, I could buy a car for 3 grand, insurance, taxes, a break down here or there and total 4 grand. Then I can sell it and maybe get 500-1000 bucks back at the end, a win in my mind.
I would like to thank the one poster for the information about a contact, please please understand this is a huge THANK YOU.
If anyone else has any advice on the paper work, the time, or a contact to help me thank you very much
Trent