There are usually instructions with the controller on how to set it up for both wet and dry conditions. My 1st concern is if it is over sensitive and you start locking up the trailers wheels. Maybe going without
brakes for a short distance until you can calibrate the controller might not be a bad idea.
In our case a dealer had just serviced the
brakes the day before and the sensitivity was set way too low and the manual override didn't work. When a triple semi when by us going down hill, at about 80MPH, the Airstream started to sway and, basically, the tail wagged the dog and it spun us around before stopping. No injuries, but the inside of the trailer was a mess and the
tires were shredded. We came to a stop faced into traffic, a real "E-ticket" ride.
BTW: She refused to ever drive with the trailer attached for the next 9 months and 20,000+ miles of a 1 year vacation