Adjusting electric brakes
It is my experience that braking efficiency is vastly different rolling at 70 mph as opposed to 25 mph in a lot or neighborhood. When I tow my 16K lb fifth wheel, I generally have to set the in-dash controller gain of my 2016 Chevy to at least 8 at highway speeds. When I'm going up and down a lot of hills, normally, I set it higher. To set, use the brake controller only, not your vehicle brake combination, so the you will feel how much braking performance you have. Adjust the gain as necessary. The same goes for my car-hauler trailer, which I've used more for moving interstate. In town, I have to lower the gain to stop locking up the brakes and dragging the tires, and at freeway speeds raise the gain to feel the braking necessary. Every load, trip, truck, and trailer will be different and require monitoring and adjustment for optimal braking performance. This is not something you can set at 25 mph and forget about it. When the in-dash controllers came out the consensus of most, IMO, was if your controller works with your trailer brakes at whatever setting, it is OK. Some had trouble and could not get enough braking power out of their controller. This could be as said before about the computer sensors and different trailer brake systems.