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Hi Paul, Yep, the whole gizmo is mounted on, it rotates around and is pulled by that big pipe running down the backbone. The hitch and the plow frame are actually two entirely different units with the cylinder connecting the two in a lateral manner. 
The laticework of boltholes in the guagewheel plates is where the "landside depth" of the plow is set by the placement of the stopbolt arm. Hard to see in the picture, but there is a stoparm at the top and at the bottom of the plates and the gaugewheel arm moves between the two, depending on direction of travel.  Link loading="auto" style="width:auto;height:auto"> ">Link
The 3-point hitch on the tractor is then set to the "float" position by the collars being dropped to their lower position. This, in effect, puts the "plowside" depth (and the only weight the tractor carries) on only one arm of the 3-point hitch and both the sideways and the fore/aft level of the plow is set by the one arm of the tractor's hitch doing a "balancing act" to the depth of that gauge wheel. When the plow spins, gravity forces the latch at the gaugewheel to unhook, the wheel drops to the other direction and the latch then hooks again on the other short stopbolt arm. In short, the whole plow is controlled by that gaugewheel. If a cornstalk or something should happen to keep the gaugewheel from changing directions, all bets are off because the plow will head for China and stop you dead in your tracks. :>) Allan 
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