License plates on boat trailers

[Kent]

I just got back from paying my sales tax and licensing my boat, motor and trailer, at the DMV, for my new-to-me boat. The lady lifted two different license plates and asked which one I wanted. I replied that I didn't want either one of them because my trailer did not require licensing (it is a single axle and it is definitely under 750 pounds). She stated that I would need one if I took the boat out of state, especially to Idaho. I told her that I have driven a boat into Idaho without any issues for several years. I left with out paying the extra fee for a license plate.

Has anyone had any issues in Idaho, Wyoming or any other surrounding states, because they didn't have a license plate on their trailer?
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