...or do I see more 1978's and '79's for sale on Ebay and Craigslist than any other year(s)? If I'm right, I'm presuming that would be because there were more Dodge trucks manufactured during those years?? Any figures for Dodge truck sales during that period?

I'm interested in your thoughts about this...

Funny you should mention that because it seems that way to me too. Although I have to remind myself that it is those exact years that I predominantly look for anyway...

Yeah, I would have to agree that I see them more than other years. My father ordered a brand new '79 Power Wagon in late '78. It was a W100 swb 318 4 spd., Blue with white wagon wheels. Wish I had some pics. of it.