Chile is requiring (since April 2012) that all vehicles, used machinery, toys, personal effects must be fumigated before entering Chile from the U.S. on imported cargo (ports & airports). The fumigation is performed by private co. at the port or warehouse of loading, 5 days or less before the cargo is shipped. A certificate is provided and should be submitted to Chilean Customs. If your don't provde such certificate , your vehicle is retained and sent back.
DEpending on the port or city it could cost between $50 and $85. The shiping line must refer you a fumigation applicator .
RoRo shipments to Zarate, Argentina are temporarily on hold by NYK, MOL due to slowdown import clearance at the port of Zarate.
K-Line is still servicing Zarate but there is an advice of 8 days after arrival delay for docking.
Accesible ports are Montevideo , Uruguay and could be used as bridge to access Argentina
We strongly recommend to fumigate your vehicle before shipping it to the U.S. (Ports of Houston and L.A. and possible Miami)
We have had a case of a Campervan, arriving in Houston using a container and was found a bug or several of them by Customs. The bug had to be sent to lab in Houston and then D.C, for further analysis, but it was negative. However, it was said by USDA that if the bug was a menace and no pesticide against , the vehicle must be returned to Colombia.
End of story, you could end paying a lot for storage, fees for the inverstigation, hotel, food , airfare, and possible seeing your vehicle returned at your expenses. Be careful with your overland trip and vehicle before is shipped.