Will, as you already know there are only a handful of people who can appreciate (or even understand, for that matter) a vehicle done to the level of your panel truck, and they're probably not shopping Craigslist or eBay for their next purchase. MAFCA and MARC are probably the best venues for advertising it, and the chances are good that it'll still sell by word of mouth.
I can already see the emails coming in from potential eBay bidders now... "Your reserve is
HOW MUCH? Well there's another one
JUST like it listed for $40,000 less!"
Just like it, huh? Riiiight.....
Best of luck with the sale nonetheless. Hopefully you'll find someone soon who can appreciate the work and effort that go into building a vehicle of that caliber.
Deron