By my way of thinking, you wouldn't need a leveling base. Because it rotates both on the bottom and on the top, the two geared tilts on the D4 themselves become the leveler. But, I'm not sure how you use your leveling base?
One minor criticism of the D4 head: I think it's an excellent head for 6x9 or 4x5, or any 35mm or medium format camera. But, I'm keeping my second 3039 head that I have for 8x10. The actual contact area between the D4 head and the tripod crown (base) is only about 1 7/8" in diameter, whereas the contact area for the 3039 is 2 5/8" in diameter. In spite of the D4's 75 lbs weight capacity, I think that the latter head may be better for a larger camera.
Plus, if ever there's a need, I can use the 3039 head with the Bogen 4"x4" quick release plate that I have.
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