Just wondering how others deal with this problem. When plowing in blizzard conditions, the rear window can tend to start fogging up on the inside. In my conventional cab truck I can just wipe it with my hand so I can see to back up. With the quad cab, the back window's too far away to reach, and it didn't come with a rear window defroster. I tried putting a rag on a stick with not very good success, then I found a small 12 volt oscillating fan and mounted it above the middle of the window. It swings back and forth and does a pretty fair job. I posted this here in the Dodge forum, but it seems like anybody with an extended or crew cab might have this problem, too. I thought I might be able to buy an aftermarket defroster grid to mount on the window but couldn't find one. Plowing in a parking lot with customers' cars around, you need as much visibility as possible. I like the extra room in the cab, but it's hard to beat a conventional cab for plowing.