If I’m in a situation where that system has to be used….. a burning trailer is a few items down the list for sure.

Fwiw I’ve had trucks towed into work with stone dead batteries only to figure out faulty brake controllers or bad brake switches energized the trailer brakes all night…. no fires to report on my end.

I’m betting in a lot of cases those tiny batteries are in a state where they wouldn’t apply the brakes for too long anyways….. great, going to check mine.