While towing and stopping a trailer on dry pavement in most cases is an uneventful occurrence, towing and stopping in rain on wet or slick roads can be a very white knuckle shorts filling fudge event.
Especially if you happen to be on a curve or turning a corner and have to apply your Tugs brakes
Here's what happens with no trailer brakes
, Tug brakes
applied no trailer brakes, Tug starts to slow down and stop- trailer starts to slide on wet slippery pavement to the left or the right depending on your turning direction.
If you were traveling fast enough when braking it is possible and in fact probable that you will jackknife your trailer and either hit your Tug or spin it out.
Now let's say you have trailer brakes and are presented with the same set of parameters, what happens? simple Tug stops Trailer stops no fudge filled shorts, no white knuckles.
Just my 2 cents.