Water boils at lower temperatures, so you'll definitely want to check the pots periodically to make sure the water is still covering the ribs.
Also, air pressure is much less. If you assume pressure is inversely proportional to altitude, then increasing your altitude by a factor of 3 would decrease your pressure by a factor of 3. If you assume the ideal gas law:
PV = nRT,
then you must also decrease the temperature by a factor of 3 to balance the decreased pressure. This means that if you normally cook at 270*, you should be good cooking at 90*, and if you're looking for an IT of 200*, then you should find that your food is done at about 70*.
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