I had put this on the FB Owners Board as well.
Just wanna throw this out there to fellow owners. Have a 2017 with tandem trailer and brakes on both axles. From day one I didn’t feel like I was getting enough braking from the trailer. Sure enough I found, oddly, that only the left side calipers we’re applying when stopping. At the end of a trip I would see the right side rotors still rusty while the lefts were shiny from braking.
This trailer came with one bleeder at the end of the brake line. I had bled the system, got frustrated and went to a dealer and they bled, same thing. No full application on all calipers.
So I call MarineMaster. One suspicion was that they had put in a single axle trailer master cylinder. Confirmed that wasn’t the case. So they sent me a kit to add a bleeder to each caliper. Not difficult and I finally did it and it appears this has at least partially fixed the problem. After getting home I found all discs to show fresh shiny surface and recognized a difference in the truck when slowing.
So if anyone else has similar issues give Marine Master a call.
Now if I can only solve this ground issue causing the dash trailer fault to come on.