Length of Breakaway cable
Wingfoot wrote "shorter than safety chains" regarding length of breakaway switch cable. I read on this forum, I think, the breakaway switch cable must be longer so you retain control of the trailer even when it falls onto the safety chains. Only if the safety chains break would you want the "emergency brakes" to engage, because you have lost control of your trailer and don't want it to hurtle into other vehicles.
Does anyone remember where this discussion was posted on the forum?