After all the research, I wanted a Brakesmart. Problem was, I needed one for the trailer and couldn't get one anywhere. So, I bought a Prodigy under theadvice of numerous reviews on TDR and IRV2. I am completely happy with it. Install was quick, setup even quicker. And yes, it does show n. c when the trailer is not connected (or is disconnected).
Mounted on the knee bolster, right side. I agree with the previous post that I can follow my leg (quickly) right to the manual braking lever without taking my eyes off the road.
Someday I may upgrade to the Brakesmart, but the Prodigy works just fine for me. BTW, I'm pulling around 13,500#, so it's not a lightweight trailer.
Juan