Check out this thread, should answer most of your questions.
https://www.bronco6g.com/forum/threads/ready-brute-elite-ii-flat-tow-setup.94786/#post-2248085
With your 4.3L engine just about all of the supplemental brake systems on the market will work. Question is do you want a floor board probable unit or a built it unit.
Back in the beginning when I was doing all my testing trying to fine out what was going on with the brake system when in tow mode, the only time I had miles accumulate was when I left the system in accessory to see if the brakes would not go to sleep.
I do believe the failure mode come from...
Go to this thread, lots of good reading and tow setup with your bumper.
https://www.bronco6g.com/forum/threads/flat-tow-equipment-needed-to-flat-tow-the-2021-bronco.19759/page-56
On my 2021 OBX with the Modular Heavy Duty bumper the bottom of the bumper hit the loops on the LOD brackets. I do not need the loops so I removed the bottom of the LOD bracket.
Remember the brackets are made for the LOD bumper and it was a after thought to use them on the stock bumper, the...
The wires on the add on light are not going to match the Ford wires. When do you want the light to come on and need more info on the the light.
By the way how did you get the trailer lamp test to work. It does not show up in my Ford Pass app?
You know I got that message “System off to save battery“ the other day, was only parked for less than a couple of hours. Had never seen it before. I was in 4H so did not notice anything out of the ordinary.
The original problem on the 2.7 V6 with electrical brake boost, the brake boost would stay on for around 30 minutes after the doors were closed then go to sleep. This made setting up a brake system in the tow a bit of a problem.
The Ford software fix keeps the brake boost off when in tow mode...
The issue I have found from the very beginning is there are so few of us towing, comparted to the number of just drivers, is hard to find anyone who understands what goes on when towing.
I had a real good work around before they made there software change. Now I'm still working on attempting to...