Tire insight
Notice that no tire is rolling a full circle. So it's more like having to move an arc-formed object rather than a circular object. Near the end point of the arc, its "landing" spot, is where you put the weights. Then you balance the wheel on the initial arc spot, the "starting" spot. At the slightest tilt, the weights move away from the vertical axe of the center of gravity and start tilting the arc/wheel forward.
Note that there is the usual transfer of kinetic power (billard ball-like) when one wheel hits the other but without the weights, that would not be enough to move them up hill at that angle. Just MHO.
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