I've been towed 4 times in 4 states, once in tag and 3 times with a non tag coach. The non-tag instances were with tow companies provided by AAA Premier RV Roadside Assist and the tag tow was supplied by Nationwide Ins. In all instances I provided the coach particulars (length height, axle weight, etc.) to the service provider on my initial call. I also requested a low boy but height restrictions prevented that option. In all cases the tow operators were professional and knew exactly how to hook up the rig, disconnect and mark the driveshaft, disable the brakes, etc. The biggest issues were to insure that no front end damage would occur due to the lift (Magnum chassis coaches were more susceptible to this than Roadmaster in my experience) and ensuring that the rear mudflap was removed or secured so it would not drag. Also had to be sure the front end "lift" was not so high as to result in rear drag (allow for bumps, etc). I got the tow driver's cell # and followed the coach in our toad so I could alert him if I saw any problems.
Based on my experience I have a lot of respect for the tow drivers. The ones I worked with knew their stuff and were very professional. Just make sure you verify that the tow outfit has large RV tow experience. This is not a task for amateurs or do-it yourselfers.
Steve