When towing, each state has its own rules as to how much you can tow before trailer brakes are required and for good reason; you don't want to find out on a downhill, during inclement weather, that ...
A brake controller makes a trailer stop more like a car. There are hundreds, maybe thousands of accessories for trailering, but nothing makes a bigger difference than the best trailer brake controller ...
You can see why a proportional trailer brake controller might be a better choice than a time-delayed brake controller. The controller does the work of calculating braking value and time delay ...