So after talking with the dealership regarding rear wheel lock up, (Slamming on brakes to prevent hitting an object that rolled out into roadway) as I figured, their response was "Unless there are ABS or other indicator lights lit in the gauge cluster, it most likely is operating fine" Gee thanks for that great diagnostic feedback . I wonder if anyone would take a moment to test this function for me. An empty parking lot or a lonely road, truck at about 30 MPH or so, slam on the breaks and see if rear wheel lock up occurs and or ABS kicks in and is felt in the break pedal and such. As I mentioned above, it was only after a hard power stop did I feel any ABS activate and it was at the very last point before stop, during the entire stop the rear wheels were locked up so I assume it was activating due to front wheels. Maybe its cause I have no weight in the rear of a short bed? I am only speculating. Thanks to anyone who checks this out for me!!