I am a new 2011 GMC owner and I have a question regarding the ITBC. Has anyone hooked up a trailer with electric/hydraulic brakes to an '11 GMC with the ITBC? If so did it control the brakes properly? I ask because my Owners manual states that it is only compatible with electric brakes and I have a trailer with electric/hyd disc brakes and although my 08 Ford had a ITBC the Ford owners manual said the same thing and it controlled the brakes just fine. I know when I hook it up I will find out the answer but I'm curious to get some answers ahead of time so I might know what I might be up against, thanks.