I was attempting to find this when the "what do you tow with" thread came up again.

Notice that not all state laws allow 8'-6" width trailers (or load) and check out Hawaii's max. width of 9' <img src="http://www.catsailor.com/forums/images/graemlins/shocked.gif" alt="" />

Also check out the maximum trailering speed limit for your state. State by State Towing laws DL