want to buy a car in peru

wanted to buy: 4wd or van in Peru - foreign registration

Hello, I am considering buying a car or van in Peru that is registered in Europe, USA or outside of South America. This will allow more flexibility for future travel plans. First of all, is this legal to do and how complicated will it make border crossings?
I am considering a few options:

1. Van - VW t3 Kombi or similar Toyota Hi-Ace van. 1980-1995.
2. Toyota 4runner or similar four wheel drive. 1990's.

I am leaving Lima tomorrow for Huanchaco and will be in that area for several weeks.

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