That first picture also made me wonder just how far that rack extends beyond the side of the truck. Of course it says it's for "light duty" and I'd say that's sure right.
The only time I've had one myself was in 1970 when a friend who was learning to weld (he learned well and quickly, too) made one for my truck similar to the one Eddie Walker mentioned. And the reason I needed it was just to haul my 17' canoe.
But I'd definitely want the full rack.