Thanks Mark!
JC "olsbooks" reminded me of a major oversight on my part. It is possible that the driver hadn't loaded up for the trip yet, so the; suit case, thermos, cooler, water jug, and snacks, etc. might not be found in the truck yet, but there would surely be a few 8-tracks laying around. I have some great memories of riding in the 79 KW my dad drove listening to a Merle Haggard 8-track.
I corrected the problem. There's Merle Haggard and Johnny Cash on the heater box. Dave Dudley will be in the player over head. Here's what I have so far:
IMG_2712 by Brian Smith, on Flickr
Thanks for the reminder. And by the way, I have a working 8-track player in my kitchen.