Michael -
Dual-cam sway control shouldn't be a problem, since it is part of the spring bars.
However, the framework at the break in the swing tongue will interfere with the flat bar of a friction sway control such as the commonly-seen Reese unit. These can be recognized by the presence of the mini-hitchball on one side of the the TV half of the hitch. I suspect that this is what your dealer is referring to.
I agree with Leon. Although sway control will not harm anything, it is not needed unless you have some strange combination of tow vehicle and trailer. You might consider adding a signature line to your profile, to describe your rig.
Bill
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