Sparffo;10832 said:
Why not use Hardox steel??? i just don't understand? here in Finland wood beds where used in the -70's and -80's, these days everyone use metall. For rock, dirt and concrete Hardox is prefered English - Hardox

That would last a lot longer, but the problem is weight and repairability. You want something at the load point of the bed that will give if hit by the loader/excavator bucket, but that doesn't add too much weight tot he truck reducing the carrying capacity. No matter how good your operator is, he's going to hit a truck bed at some point. I know I have hit my share in the last twenty years (sometimes to wake the driver up!).

Also try UltraTec Products Inc - Home Page. They offer a similar product.