I also think power window motors would work nice. I have a set I pulled out of the junk yard from a mustang that I plan on using for some aero projects.
To control the motor I would use a limit switch set up similar to what is used in overhead doors and electric gates. That way you can "set it and forget it" by using micro switches built into the mechanism. One limit switch would be for the "full open" end point and the other would be the "fully closed" end point. When you turn your toggle switch in the cab to "open" the motor would run until it bumped into the "fully open" limit switch and shut its self off.
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