They build all the racks for our fleet. For a standard headache rack its $185.00 installed. Tell them Scott from Digicom sent you and you might get a better deal. They can customize them also, add light mounts, steel mesh, shades, whatever you need.
I used a rollbar in my Ranger for hauling carpet to job sites.( Flooring installer by trade. ) Thought that a rack would work well on my F150 for the same thing. Although , I don't haul as much anymore.
A lot of guys put lights on top too. Usually see them on construction or ranch trucks. Keeps stuff from coming thru back of truck in a emergency stop situation.
P.S.: HAPPY NEW YEAR TO ALL!!