My 2010 F150 would easily lock the brakes up on our previous trailer. My Ram 2500 TBC wouldn't lock up the brakes on the same trailer. It will lock them up on the current 5er if I have the TBC set to 'Heavy' for trailer weight. It won't lock them up with the manual lever on heavy. But if I hit the brakes hard they will lock. Biggest issue I have is the Ram TBC won't release the trailer brakes smoothly. Pretty annoying when in town. Or for that matter going thru a CG. I ended up buying and installing a Tekonsha Primus IQ. Works way better. Not as smooth as the Ford though. That was the smoothest TBC I've used to date.