Why worry about that? Just tow and don't worry as long as you are being reasonable. The bicycle industry has sold millions of trailers and there are probably about 15 to 20 manufacturers of trailers. I do not ask permission to breathe and God gave me the right to do many things. He gave governments the right to do few things. Don't ask them to get involved in what they know nothing about.

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LennyHarp of Lenny's Bikes & Things
http://lennyh.com
The true value of a man is not judged by what he has, but rather by what he can do without.
"We are what we repeatedly do. Excellence, then, is not an action, but a habit." -- Aristotle