Floor failure!!!

The way it is supposed to work for max emergency braking is that you set up your brake controller so that at its maximum adjusted output voltage (when the manual slide is fully on) the braking force is just short of lockup on dry pavement. That is the setup procedure the controller manufacturers recommend because that will give you the shortest stops. If you set the controller voltage higher and apply full brakes you will  lock up the wheels which will cause the braking force to go down because you're now skidding along on a patch of melting rubber so the friction coefficient is reduced. If you set the voltage lower then you are not going to get all the possible braking action if you ever need it. 

On many travel trailers, my rPod being one, you can't get enough braking action to lock up the wheels even at full voltage from the brake controller. The brakes just aren't powerful enough. Since I can't get there I have no idea how much more emergency stopping power my tires could give me before I start to skid.  If a trailer salesperson wants to call that a design "feature" ok I guess, but to me its a design weakness.   I'd prefer to have more brake capacity available and be able to adjust them with my brake controller to the level I want.