I had forgotten how smooth and easy the BrakeSmart works. I had to use my buddies 3/4 ton Duramax and Prodigy brake yesterday, 10 Ton goose. Holly cow.....when I first hit the brakes I really thought the trailer was disconnected! Well, I thought that until the trailer "grabbed" and then slid to a stop. I would highly suggest either of these controllers. If you have not tried one...... get in a truck and try it, it's just WOW! BTW, you can "lock down" the brakes with a BrakeSmart. I do it every time I load equipment. I can load up or down hill "without" using the trucks parking brake. And yes, I have lifted the rear wheels off the ground while loading in bad spots. ...Oh yeah, the trailer never moved. waytogo