It's late, but you may want to consider hiring an independent auto appraiser to document and value the SUV. An independent documentation for replication wouldn't hurt.
Real world problem is a corporate bean counter adjuster would average two book values and want to pay off NADA value.
Even Old Cars Report Price Guide which used to be a good source for hi end vintage cars has a low value against Resto Mod values v. Costs.
Velocity starts around $100k for a restoration and upwards of $250k for a Resto Mod.
DuPont magazine might be a good starting point searching for the right insurance and people to document & value your truck. Years back, it was common to re Appraise classic cars annual.
Chubb Insurance or Haggery are preferred under writers of hi end property.