1997 suburban brake controller wiring ??

I thought that connecting a brake controller to my 97 suburban was going to be easy. Maybe not !! As far as I can tell, there are no brake controller wiring adapters available for my rig. Does anyone know of a reasonble way to get a brake controller hooked up either though the 10 pin connector under the dash or through other means ?? Any help or suggestions would be appreciated.

thanks

dave