Same way you'd run anything else like wiring or brake lines. Follow the frame rail back, then drop down at center axle and go out. Or just do like any late model truck does. As far as the pedal goes, just need a 2-to-1 bracket.
Does anyone know if a cable upgrade kit exists for parking/e-brakes, that eliminates the old eyelet system and just has cables that run directly from the parking brake pedal bracket to the rear brake assembly? Or can I just order cables made to length from somewhere?
I've got an 83 K1500 long...