For what it's worth...if your vehicle, or what your towing, is more than 80" wide, they should be there - at least that's what my research has revealed.
Technically the lights are only required on the thing that's 80" or wider. So that would only apply to the vehicle itself. The thing you are towing is supposed to have its own set of lights if it's that wide and has an engine in it.
edit: I added the engine in it part
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