I need to at least keep the connection with the trailer brake.

If you have brakes on the trailer that is a good reason NOT to dunk
the wheels. They don't like being wet, particularly salty and wet

Oh well... I guess I will have to disconnect all the wires that will
disable the brake in the trailer. I hope my towing vehicle will not
get dragged into the water (a PathFinder with 4-wheel-drive).

Jay Chan