[Zeke]

I say the pic is a fake. You can see what 13 sheets does to a transporter and they have a little load capacity, they were designed to carry 500 lbs, IIRC. Although the sheets on the car don't look like 5/8, the stack is higher (I count about 25). PLUS, the lumber.

At that angle, the strings would have snapped and the load would have slid off. I have carried my share in 30 years as a carpenter.

I once had a moment. I loaded some lumber on a rack that I had built for a PU. I put the rack legs in the stake pockets. About a block from the job, the bottoms of the stake pockets gave out and the load crashed onto the cab! Caved it in a little, but scared me and my helper pretty damn good.

It was then that I noticed that lumber racks have angle iron stops on the legs so this doesn't happen. Duh.