I have seen this site before while looking for specific answers, and I thought some of you may not know about it. It's got a lot of dead links, and tries to send you to a rental site way too much, but much of this information is difficult to locate otherwise.
http://usroadconditions.com/
I thought the state by state towing laws were of interest seeing as how there are differing opinions about how fast to tow with your TM. I hadn't thought about a maximum speed limit for towing, and sometimes have exceeded the Arizona limit. Good thing nobody in Arizona tickets for speeding.