Made this two piece for a neighbor's truck.
He wanted it to be bolt on, easy to remove for wheeling, and to be able to install them without getting muddy after a day of wheeling. I used two holes in the rear of the frame to bolt some mounts too, the two sections slide in, one from each sidem, and I used a hitch pin to secure them.
This is what I made for my flat bed,
If you are still running a bed, you could weld the square stock to the frame at an angle, so it would be easier to install/remove the mud flaps.
