Research this carefully before you buy and install a toad braking system. I found this link that gives a little information on the subject.
http://www.rversonline.org/ArtFAQ10.html
From past reserach, I believe the law in Canada was that any tow car behind a motor home needed to have a barke system that would stop the tow car if it came loose from the motor home. I do not think it is a requirement for it to be connected to the air brake system. There are a lot of systems available for installation in tow cars that will apply the brakes in the event of hard braking by the motor home or if the tow car breaks away from the motor home.
Please review http://forum.prevostownersgroup.com/...splay.php?f=10 for a LOT more information on towing.