I prefer brakes as soon as the trailer weighs more than half of the tow vehicles weight. It reduces the risk of jackknifing, and lowers the wear on brakes of the tow vehicle. in the end it just reduces your brake distance to, not so much more than an empty tow vehicle.
The general population in the USA isnt so brake minded because of cost and maintenance, but in crowded Europe, you just NEED it buy yourself some stopping seconds, to drive comfortably in crowded areas.... Its not fun seeing your tires smoke, feeling your rear axle being pushed around, when making an emergency stop because the idiot in front of you just stops in the middle of the road to take a left turn, but the opposing lane traffic doesnt allow him to cross the lane.
I had two near incidents with my previous trailer i used to haul scrap with, loaded to around 1000kg total, no brakes, behind my S70. When i delivered my last load, i didnt unload the trailer but just parked it near the scrap heap and left it there.
I have a big steel scrapbin now, which i load onto my tandem trailer with the frontloader: A load weighs about 1200 to 1500kg, but the other day i had to make an emergency stop because i didnt see the long row in front of the traffic lights, due to a low hanging sun: When i slammed the brakes, it was smoking rubber behind me, not just because of my trailer, but also because the car behind me was trying hard to not rear-end me...
I'm sure when i was in the exact same situation with my old trailer (with no brakes but less weight) i would have generated some more scrap to sell off that day...
