Depends on the company, the rig and the driver.
Lots of tractors have racks/chain carriers/toolboxes but usually aluminum and U bolted to the frame. Not tough enough for
this type of load.
Some who value their posteriors;and haul mostly this type load or sheet steel, do have a bulkhead on the trailer.
Very strong , overlapped and welded to the trailer frame. Inconvenient if you need over hang on front for length.
Depends on the circumstances at the time of dispatch/loading/driver sense I suppose.