If they’re available, insurers will often use comparable sales to determine how much a classic car or truck is worth. Because classic vehicles are relatively rare, however, there frequently aren’t enough comparable sales available. Therefore, insurers frequently supplement comparable sales with auction sale prices, third-party appraisals, and receipts from any work done on a vehicle. Owners who would like to have a third-party appraisal done in case anything happens to their car or truck may find a qualified appraiser at a nearby classic auto show.