Barry - That's too bad that your original appraiser turned out to be a waste of time.
Just IMHO, but knowing that this truck is #2 off the line for the 1957 Model Year, also that Cameo's themselves are special trucks all by themselves, I think you'd be best served by locating and contacting a recognized appraiser that specializing in such vehicles.
I did a web search and one thing I found suggested was to seek out someone with the International Vehicle Appraisers Network (I-VAN) or a Classic Auto Appraiser. Here are some links you might consider checking out:
International Vehicle Appraisers Network (I-VAN) - Appraiser LocationsASCAA | American Society of Certified Auto Appraisers In Salt Lake CityI have no personal knowledge of these appraiser sources, or experience using them, but think they are a better options than some local yokel unqualified to do such an appraisal. Hope this might provide some useful info.
