Do you want to travel in the north or the south of Chile?
One big thing to keep in mind is that February is the month that all of Chile takes vacation. So booking asap is important.
If you want to travel in the north you could fly into Iquique and traverse the Atacama down to San Pedro, then on to Calama and return the car there and fly out.
You can rent a Hilux 4x4 in pretty much all the rental car places in Chile north and south. But supply is limited because of mining operations which use rental trucks.
If you wanted to travel in the south you could fly into Punta Arenas and drive north to Puerta Natales and on to the Torres. Then return back to Punta Arenas and return the truck and fly out.
Both trip are an easy 7-10 day and longer of you really stopped to see all the great things on both areas.
Start with these guys, they have offices all over Chile. As far as leaving Chile to go to Argentina or Bolivia, I am not 100% certain you can. I was told no both times I rented in Chile. Hope this helps. The prices for a Hilux were over $100 USD a day. So its not a cheap choice to rent a 4x4. However the roads in the north and the south are not great and the trucks take a lot of abuse. I used 4wd in the north but not the south. However I did see a guy in a standard car in the south and he had a broken ball joint in the middle of no where. So a truck is advisable. Even a 2wd Hilux would be fine.
http://www.econorent.cl/
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