Our 14000LB 5th wheel brakes will not lock up no matter how hard I step on the peddle or use the lever even with the gain all the way up. I did find that the electronic controller on my new truck engages the brakes significantly stronger than the old hydraulic actuated controller I had on my old truck.
With the old truck I was very unhappy with the trailer brake performance. I had checked the amps at the trailer plug, re did the brake connections, adjusted the brakes and nothing made much difference.
With the new truck and the electronic controller the very first time I engaged the brakes they came on much stronger. I am happy with the trailer brake performance using the electronic controller.