"Gary Warner" wrote in message
news:2g7o7oF5e1unU1@uni-

Of course, when backing up a surge actuator will try to put on the
brakes, which is not what you really want.

My understanding (and limited experience) with surge brakes is that a
certain [adjustable?] amount of decelerative force is required to activate.
Simply backing the trailer at slow speed has never activated any surge
brakes in my experience.

How hard do you plan to accelerate the rig in reverse? :-)