I put the F-650 dash in my 350 a while back and my truck has a factory trailer brake installed but I don't have anywhere to put my TBC. Since I still haven't gotten around to installing switches in the lower dash yet, the unit and the upfitter switches have just been kinda chilling in the opening where the switches will go. Originally I just took the unit out but put it back in for a couple reasons, A) the damn "TBC Fault" that would pop up every time I would key on, and B) I love how it performs, nice smooth positive braking even with the gain turned up to 7.5, leaps and bounds better than my dad's aftermarket unit. I wouldn't mind mounting it to the bottom of the lower dash if it didn't have such an awkward shape, not to mention the clearance issue with the shifter. Has anyone done anything like this? Pictures would be amazing if you have.