The price quoted is a large multiple of the current value of the truck.
The end product will be 10 X harder to sell at all than it is now or restore, the number of people who want it is much smaller.
I agree, the only hope of getting your money back on a sale is DIY.
The biggest loss: run out of money, or change your mind mid-stream.
Is that truck the one you really want?
Some of the most successful con artists seemed like really nice guys at the time.
The IRS is a giant headache to install and adjust many times, and has minimal effect on ride quality for the price.