Used dodge truck .

OK, so essentially everything from the back end of the cab to the rear bumper needs to go. That might be less that $30K in parts ( maybe). How many here have a frame jig that they can use free of charge? I don't.

My opinion: That's a parts truck now, and a future rolling group of issues and problems for any back yard Billy who is going to repair that by hand.

There is a reason the insurance company is "totalling out the truck, and, I, personally, have no need to take on a project that will end up costing over $50K before it's done, and you simply end up with a 2 year old truck for the price on a brand new 2015 3500 Cummins dually.
The guy is being truthful in that a used frame is roughly 2 gees, frame can be changed in a day and a half with the right equipment and experience ( easily ) used bed assy might be another 1500 bucks, doubt differential has any issues nor springs but I would be looking at the trans pretty hard.

Assuming no major drivetrain issues that truck could be fixed for less than 5 gran.

Truck is still only worth 12-15 in my opinion though because I am not figuring the labor.

Geico for instance is now totaling most vehicles at 50 %, its been mid to late 70s for as long as I can remember, I am sure other insurance comp. will follow suit. The cars are bringing more for salvage and the carrier dosent assume any future liabilities and that is why the vehicles are totaling sooner now than in the past.