Your set up looks awesome to me. My first truck was a C600 when I did not even have a license to drive. That was almost 40 years ago. I think my legal limit is 40,000 LBS. Our highway patrol stated its not how big the truck is or how much it can handle or the Gross Combination. but how fast can you stop. The trailer has six 12'' brakes and still struggles down a long hill. Yes we have hills. I would likely never use a dump trailer because they are so heavy. Those that do not have hills seem to breeze along. Thanks
Some trailers have breaks some don't. Most only have breaks on one axle if its a tandem axle trailer. Most single axle trailers don't have breaks at all. My tandem axle trailer only came with breaks on the front axle. I added new drum hubs and breaks on the rear axle so mine has breaks on both axles. I was a trucker for 30 years and most new trucks have plenty of power to get even a heavy load moving at highway speeds unless your pulling grades. And you are correct, it's not that your truck can pull the weight, but how well it can stop it. We have all topped a hill and seen nothing but break lights as far as you can see. Many roads don't have emergency lanes or have K rails blocking you from moving over into an emergency lane so you have no where to go if you can't stop. Pulling is one thing, stopping is another and far more important. Also most trailers that do have breaks are not self adjusting, so you need to manually adjust them periodically.
Also you must have a
GOOD quality break controller and learn how to use it properly. A 50 dollar break controller is not going to work as well as a 350 dollar controller.
The cheap break controllers work off your break light circuit and suck when your in stop and go traffic.
The better ones have speed sensors and a mercury switch and G force sensors and adjustments for how hard you engage and how fast they engage. Most cheap controllers only have zero through 10 in increments of 1/10.
Mine has 1/10 but has increments of 10 on each number setting. So I can set it at 1.1 or 1.2 or 1.3 and so on all the way up to 10. And it has an emergency lever or panic lever that will instantly go from zero to full lock with a simple lever. Once you come to a stop, if you have a cheap controller as long as the break light is lit, like if you holding your foot on the break at a stop light, the trailer breaks are fully engaged. Mine has a sensor so once your stopped it backs the break power down to a minimal amount.
Say I have it set at 5.5 and when I hit the breaks it goes to 5.5 till you start slowing down then it slowly starts backing the breaking power according to your relative speed. Once I'm stopped at a light it drops the breaking power sent to the trailer breaks down to 1.5 while your sitting still, even though you have your foot on the break and your truck break lights are on.
The cheap one's you have to take your foot off the break and let the break light go off before the trailer breaks will release.And that can be very annoying in stop and go traffic.
The good break controllers are worth every penny because they give you much more control and more adjustments to fit your breaking needs. You can dial it in to do exactly what you want and need over your trailer breaks. I can adjust mine to stop hard by the G force the mercury sensor picks up and it will go to that setting. But it also has a delay from instant breaking to 1 second or 2 seconds up to 3 seconds after you hit the breaks.
The good ones work much better then the cheap ones do. Mine even has LED light that tell you if your breaks are connected and are working, right on the controller module. If one or more of those indicator LEDs stops working or starts flashing, I know a light is out or there is a problem. Lastly, make sure you have a secondary detected ground wire from the trailer to the frame of your tow vehicle. Most ground through the ball hitch and if you don't have a good ground, it's not going to work properly or at all.
If you have break or light issues, always check the ground first. Thats is where most issues come from, not having a good ground.
Also change your incandescent lights to all LED's. Most light bulb failures come from the light filaments getting broken on bumpy roads. LED's last longer and don't break the filaments and work much better.
If you can afford them, get self adjusting trailer breaks. It's a pain in the ass to crawl under a low trailer and try to adjust the breaks.Especially if it's wet or muddy. Don't forget to check your break away switch and battery and make sure they are in working order.