Last year when we bought, the brakes were an issue. The install of the 7 pin connector in the bed is anything but elegant = splice the lines with crimped connectors. Definitely not a varsity job, You'd think there would be a wiring harness adaptor. Well, one of the box type fuses in the truck blew resulting in zero voltage to the brakes. No indication of the fault on the IBC. With the new fuse, braking improved, but was definitely not great.
I took my Sundance to the dealer today for a couple of punch list items prior to the end of the 1 yr bumper to bumper and to address my concerns about the brakes. The tech first addressed my TV - a 2005 F250 with tow command IBC. He hooked a device to each of the 7 pin connectors to test the voltage. With the vehicle in park, he activated the brakes with both the brake pedal the the manual level on the brake controller. In both cases the device indicated only 3 VDC! No indication of this fault on the IBC! His conclusion is that something was wrong with the truck.
The truck's at the ford dealer now for troubleshooting. 5 yrs with the TT and no problems. One year with the 5er and only problems.
Comments and observation appreciated.