I bought a new FW last August. The brakes seemed to work well with my controller. I have about 2000 miles on the new trailer brakes, so I figured they may need adjusting after my first trip this year.
I ordered a new Super Duty the end of Feb. I have only had the new truck about 2 weeks, but did a short pull, to set the gain, and also check the bed rail clearace (new truck & new B&W hitch).
The book said set the gain at 6.0, as a starting point. The brakes locked hard. I set to 5.0, and still locked, but not hard. I set to 4.5, and was just right. I don't think I'll even bother checking trailer brake adjustment.
I think you should have a good trailer service shop check out the brakes on your new trailer.
BTW, I did my testing on concrete.
Jerry
