I mounted my Maxbrake on the dash, just up from the left radio control knob. Figured it was a natural motion for my right hand from the wheel and still out of the way of steering. Will eventually paint it to match the dash (wanted the warranty to expire first). I had to add ~18" to the harness length. 2005 Chevy 2500. Simplest unit I have used, works very well, for single axle 2000# trailer (empty to full), same for a 16' flatbed, and my wifes 3 horse trailer. Oddly enough, all three used in the past 2 weeks. The only thing I do is twist the gain up and do a quick (clear) road check. Considering all the things we spend money on, the cost is relatively little compared to a couple of months of cable/satellite tv.
And no, not using one doesn't mean that you (or anyone else) will get carbunckles. But it sure is nice to take one more thing off of the 'what am I forgetting....' list. The features really add up if you pull more than one load/trailer.