Are these trucks getting more valuable in todays market?

[KMK454]

I was offered $8,000 for mine back in August of '13 by a car dealership owner who saw it. It was a serious offer, but I said no. In 2010, I was offered $9,000 by somebody at a car show who had one just like it in the 80s. Not sure how serious he was, but I declined.

I love my truck too much and don't need to sell it, so if you want it, you have to pay the "truck separation fee," which brings its market price to approximately $20,000