Look up a member named Shreesh. He did this trip a year or so ago.
I lived in the Patagonia for a few years. And although I have not seen everything on Earth I am comfortable saying that it is in the very top tier for beauty on this planet. You should aim for Ushuaia (the end of the world) the boats that go to antarctica leave from there. I lived there 6 months during the summer 1999-2000. I still get a little emotional thinking about the things I saw there. Perito Moreno is down South and that alone would be worth the drive from the U.S.
I've driven 85%+ of the highway through Chile. Chilean food is gross. There are many things not to miss in Chile (Beaches, Osorno, Torres del Paine etc..) But having seen Chile, if I had 2 months to spend I would spend most of my time on the Argentine side.
(No offense amigos, it is beautiful make no mistake)
The trip through central America would stress me out a bit without some good support (at the very least a spanish speaker
). The FJ won't exactly blend in down there. Argentina & Chile seem to be a lot more safe, but can still be very dangerous. Things not to miss if you're going to be down there already:
•Iguazu falls (borders of Brazil & Argentina)
•Bariloche & Villa La Angostura, (stay at a B&B in the Villa or the famous Llao LLao hotel.
•Aconcagua (Highest peak in S. America the switchbacks on the highway near there will blow your mind. You're destination seems 200 yards away, but you have to drive 200 miles back and forth to get there.
•The city of Mendoza is one of the most beautiful I've been in, but I don't know what to do there activity wise unless you like clubbin'.
•Puerto Pyramides is a day trip out on a peninsula on a dirt road but you will see much of the unique wildlife of the Patagonia. If you're lucky the Orcas will be feeding on the sea lions at the beach, and you will see some whales along with guanacos and some big ostrich-like birds that I can't remember what they are called right now, and penguins, and more. You would stay in Puerto Madryn a town built on a bay and you might see some whales and dolphins from your hotel, if not a short boat ride usually fixes that.
•I mentioned Perito Moreno, and you would have an empty checkbox in your bucket list if you didn't go ice trekking there.
•On the island of Tierra Del Fuego there is world class fishing in the rivers near Rio Grande, and of course Ushauia. If I were a God tasked with painting a better end to a trek like the one you are proposing than Ushuaia. I doubt I could do it.
Argentine food is Amazing (for the most part). Asados, milanesas, empanadas, dulce de leche, the beef is well above average (I didn't eat red meat before moving there, but I changed my mind)... oh and find some mate-cocido to help aquire the taste of mate, if you make friends with anyone down there you will surely be invited to share in the Argentine drink of friendship. I dream of an overland trip along this same route. It is just a dream for now though. Good luck, and thanks for bringing back some of my most precious life memories.