In reading through assorted posts on the RAM IBC issue there seems to be some confusion as to how electric trailer brakes work.
When properly set up, the trailer and truck should share the braking, and the total stopping distance in a panic stop shouldn't be much longer than what you would get with the truck alone empty. That said, the effectiveness of the trailer brakes vary based on trailer load, brake adjustment, tire condition etc so you need some means of fine tuning the braking so you get the most braking possible when required, but not to the point of locking the tires. Normally to dial that in you would set the gain to where the tires locked with the slider at full braking then back off a notch on the gain so that the brake controller would send the right amount of power to the brakes under max braking to almost lock the tires. Given no antilock brakes on the trailer this is the next best thing. Especially with the integrated controllers in modern vehicles you should be able to send a signal to the electric brakes proportional to pedal pressure and thus get smooth performance under normal braking and still be able to get the shortest possible stopping distance if required. By limiting the output of the IBC to only 65 percent or so and slower speed Chrysler has taken away the ability to dial in the brakes for maximum performance. That said, for my truck even with the gain maxed out it doesn't sent full power to the trailer brakes even at speeds over 45mph.
