I did a similar thing to my Tmaxx i used to have. I got a second disc, and 2nd set of brake pads. I then ground down the brass push rod so that both discs could sit on the disc carrier. Then dremelled a small part of the chassis so there was enough clearance for everything. That was all it took. I dont know if this helps you though as i am not familiar with your trucks layout, but it might give you some ideas.