I am planning a tour through South America, Argentina, Chili, Ecuador, Peru, Bolivia, Columbia, etc. Lots of rough roads so I was thinking of taking my mid-1990's Trek 7000 mountain bike instead of my Surly LHT (56cm, 700C). The Trek has decent mid range machinery, and I think I can install F&R racks and fenders. It is essentially a free bike to me, so no great loss if it is destroyed/stolen in contrast to the LHT into which I have a lot of recent $$$ invested.
Question: any reason NOT to do this.
I'm sure I would have to customize it a bit (new wide tires, etc).
All thoughts appreciated.