A quick internet search pulled this up.
http://www.rvforum.net/SMF_forum/index.php?topic=14160.0http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/14830464/print/true.cfmWhen you read this stuff, it makes for a good reason why one should look at a fool proof system like ReadyBrake, so one is not depandant on software design or other electronic stuff that can fail mysteriously. Since ReadyBrake is fully mechanical, it is easy to inspect, so you know you can depend on it. It will also be less expensive than any other braking system. A quick search will show many satisfied users here, including myself.