I recently purchased a small tow car (known to RVers as a TOAD) and was trying to figure out what kind of Supplemental Braking System is required by the laws of the states I plan to drive through.
This was a bit of a mystery to me and whenever I called any RV Parts store they were recommending some pretty expensive stuff for me to purchase and have installed.
After some research, I found that every state has its own laws about supplemental braking systems, and I pulled the information together in an article of mine on HubPages, if you want to know what I found.
Also, during my research I found a link to a site that lists the legal limits for all 50 States and Canada. Check it out to help you with your decision.
by Don Bobbitt, 2015