what size trailers are you towing? I have never used a brake controller before. Do you mind explaining how they work?
All the trailers I have towed have surge breaks on them.
I hate surge brakes.
So far I haven't really needed a brake controller for anything my Ranger has towed. I have run an F-350 dump for work pulling a 2 axle trailer with a skid steer and I gotta say, it is quite nice having electric brakes on the trailer to help slow things down.
I do intend to buy or build a skeletonized trailer for hauling my choptop on (I think I can make it work to where I'll be just under the max towing for my Ranger), but I don't want to run without electric trailer brakes with that sort of a load. I'm also thinking of getting a smaller trailer and have been toying with the idea of outfitting it with electric brakes and a pintle hitch as well.
Electric brake controllers collect input from your brake pedal and convert it to electric signal that they send to the electric brakes on the trailer. The harder you push on the brake pedal in your truck, the more braking force is also applied to the brakes on the trailer which help to reduce your stopping distance and keep the trailer under control during slowing and stopping (it's a real big help when some idiot cuts you off). You're still not gonna stop as fast as empty with no trailer, but a lot faster than a with a trailer with no brakes. Plus such setups require a breakaway switch, which means that if the trailer comes separated from the tow vehicle, it causes a switch to function which activates the trailer brakes, keeping it from running out of control down the road (and killing a few people in the process... that's happened twice now around where I live in the past few years, trailer came unhooked and someone else paid the price).
Me, I'd rather be safe than sorry. That's why I use tie-downs and rope religiously to secure loads. When it looks like it's tied down good enough, if I can find another spot to throw a tie down, I do. Been that way since I lost a 4x8 sheet of 1" blue foam out of the back of my Ranger when I had a cap on. I suspect that whoever was behind me when it came out wasn't too happy.