I tow a Scamp13D (7" brakes) with a Ford Ranger shortbox (4.0L) with the big axle
and big brakes with the ABS disabled. This truck has been worked for 15years and 170000miles so far, pulling car trailers, RV trailers, and car dollies. It is still in excellent condition and will (God willing) make another trip to FL in a couple of weeks.
A few years ago, I was westbound on I-40 at about the NC/TN border.
It was raining and had been for a day or two.
A midsized tree fell onto the highway mostly blocking the right lane.
A woman in a small car panicked and jerked her car into the left lane only a few car lengths in front of a semi-truck. She then, for no apparent reason, slammed on her brakes! The truck driver was barely able to avoid running her over as he braked HARD to a stop. We were behind the truck expecting to pass the tree and continue on down the road.
Fortunately we were following at a safe distance, but we still required an emergency stop with almost no time to flash my brake lights
to warn those behind us. The brakes on my truck worked flawlessly and brought us to a safe stop. The brakes on the trailer worked as expected and slowed the trailer.
I think that 7" trailer brakes add to stopping and handling, but no more than a friction sway bar when it comes to handling. Each of which will help keep my Scamp13 behind the truck, but neither of which is necessary for safely towing such a small trailer with a vehicle which is more than up to the task to begin with.
That was the only real hard emergency stop I have had that I recall in the twelve years of towing my Scamp and it did not even raise my heartrate.
Of course there are times when hard braking is necessary in ordinary traffic most of which can be avoided with good driving habits.
Last year we drove through AL on black ice on which brakes can be at best ineffective, we saw many dozens of cars and trucks in the ditches largely IMO from traveling too fast and too close.
If you must tow in extremely bad weather... slow down and keep your distance, then get off the road if possible until conditions improve.
BTW; I have towed dozens of small fiberglass trailers and utility trailers which had no brakes. I have never encountered a situation where I felt the need for trailer brakes on any of them.
Still I find trailer brakes to be useful, and I whole heartedly endorse them.