If you really want to know how the law looks at it, pay an Attorney, or find one who you can get a free consultation with and sit down with them and discuss it. I would never take the word of anyone who has a disclaimer stating the information may not be accurate while presenting it as accurate.
Personally, I installed the TOAD brake, and a breakaway. I have seen head on collisions, and while it is rare to see a TOAD break loose, it does happen. There is a reason they are called "Accidents" when they do break loose, but for my piece of mind, and knowing I would not fare well if mine broke loose and killed, or maimed someone, I installed it. In my opinion this is not about the law, or what the law requires, and accidents do happen.
2007 Fleetwood Excursion 40E
2007 Chev Classic CC LB D/A - Toad
2013 Jeep Sahara Unlimited - Backup Toad