I did try to reason with them and pushed it as far up the ladder as possible. Bearing in mind the accident happened on 28th Feb. Their final answer came today.That would be a disaster. I whacked my new van through a buying site and it's tens of thousands out and that's a stock vehicle.
Valuation should be by comparisons with like vehicles, additions/ommisions noted, maybe depreciated a bit but not much atm.
If it's a house, the definition of fair market value is "what a willing buyer would pay a willing seller." I'd also look at the cost of replacement and note comparables as evidence.
I sent a complete list of mods, and similar vehicles. They just aren't having it at all