Since I have a sliding rear window I can't add a conventional wired aftermarket defroster to it. I did have this idea though, but I'm not sure exactly how to actually implement it. What if you could somehow effectively harness some of the forced hot air from the foot position and send it up tubes through the A and B pillars, under the roof lining, and then out through where the hangers are on the cab ceiling. Then have some sort of diffuser to fan the air down and out towards the rear window, thus creating a defroster of sorts.
Like I said, itís just a rough idea Iíve been mulling over, and thought Iíd put it out there in case someone has either done it or wants to figure it out and then post the results.