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Two problems using a standard towball.
The first is the amount of clearance under the towball, however it's only in one set of circumstances that it becomes a problem. This is where the car is going up a steep ramp while the van is still coming down a steep ramp, ie, the loading ramp of a ferry at certain tides, (that's where the problem was first found), or it could simply be a steep hollow in a road somewhere. Once all the clearance is taken up, the hitch will try to force itself off the tow ball and even if it does not succeed, it will damage the locking mechanism and could lead to an accident at some point further down the line.
The second problem is constant, this is the relatively soft zinc coating on a standard ball, the pads will tear into this and the bits become embedded in the pads. Even if this does not impair the hitches performance requiring the pads to be replaced, it will certainly make it very noisy in operation!
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