Where will the camera be for 5 - 30 minutes? If its outdoors, then I see the biggest battle being wind, and the best combat for wind is a heavy camera with NO bellows. As its the bellows that acts as a sail in the wind, which in turn rocks the camera. The Gowland 8x10 aerial is a great suggestion, or something similar. But you did not mention how flexibe you were on fl's of lenses. If you want nothing but wide angle, I would reccomend the new Fotoman 810 coming out, or the Grandview (not sure they are still made either) or the Bostick and Sullivan (not sure I got this name right). Bottom line, any camera with NO bellows that fits your lens needs.
Of course a rock solid tripod mount and and tripod as suggested above. What are you photographing as this may help us...
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