Our Eagle has weak brakes also. After first trip dealer said they need to be broke in. They have about 3500 miles on them. While in gear at an idle, manually applying the brakes with the controller. The trailer brakes will not stop the truck and trailer. Dealer said it should. Its there now for brakes and cracked bath room fan, upgrading to a Fantastic fan.
2016 Ram 3500 Big Horn 6.7 TD
2016 Jayco Eagle 317RLOK(rear living rm outside kitchen)