I would be inclined to search the market for a similar Chevrolet pick-up truck the same year as your truck at a dealer and see what the dealer will take for the truck. Then I would go after the insurance company for this amount of money. We had a 1988 Ford Taurus that was totaled by another party back in December of 1995. I called a dealer who knew my car and asked him the value. He said he would sell it on his lot for $4000. I then picked up a free publication at the grocery store and combed the local paper. Cars like mine were selling between $3800 and $4100. The insurance company wanted to only give me $3125. I asked the adjuster to locate a car for me and get a guaranteed price from the dealer. The adjuster said that he did not go shopping. I told him that I was paid $150 an hour for consulting work (that was my charge at the time) and I would invoice the company for my time. We settled for $4000.
If the frame is bent, I don’t want a vehicle. I know that frames can be straightened, but I don’t want to take a chance with alignment problems. If I were in your shoes, I would get the most I could from the insurance company and move on to another vehicle.