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Bob,
You are right, this seems to be a personal thing. Having said that, my instincts tell me to let the larger inertia element ( the trailer) roll a bit without dragging the smaller inertia element (the truck) with it. In this case the smaller inertial element is supposed to be the control element and I would not like to upset it.
On the other hand, Like you, I don't know of an eighteen wheeler rig with a side to side rotating Hitch mechanism. However, being the cynical sort, I believe this has more to do with econmics than safety or convenience. Rarely will any one of these be required to hook up under adverse requirements -- the main reason for providing this movement. And it takes a really odd situation when the need for seperation of roll movement becomes critical. Bottom line-- if the inconvenience of having to prop up the side of your truck to hook up never bothers you, go with a single axis hitch. The choice is avaiable I hope that made sense....
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