I would be most worried about gearing. I am pretty ignorant on this, though. Have you checked fuelly? I would think there would be a couple out there in similar shoes.
I would also think a standard would be better, as you can hold the gear you want- vs an auto deciding what's "best."
Edit:
http://www.fuelly.com/car/toyota/tacoma , yea, you can definitely do it, bar any altitude adjustments.