What do you call the Bulkhead (edited since I know now)

Bulkhead. Some hardwood 4x4s, a chain and a binder is all you need to build one.

 

Bulkhead

 

bulkhead or headboard

 

Whew, thought I was at the age wherein something isn't called what it used to be called.

Headache Rack

Semi Truck Headache Racks

 

It will not likely slow down a 40K Coil loaded suicide with weak chains at a sudden brake locking stop, not that I've given such a go.

Never understood WHY it's labeled a "Headache Rack", as above "scenario", a "headache" would be moot.

 

Bulkhead makes more sense, it implies integrity & durability.

 

He's not talking about a headache rack. He's talking about a bulkhead.

Here's an example of two bulkheads. One fixed to the trailer, and one constructed to actually help stop forward movement.

OP, I've never heard of a two-chain requirement. Not sure about that.

 

Although it's Western Express, this is about the best description and example I could find on short notice of building a bulkhead/header/barricade:



The headache rack, tends to do double duty. It's a weak protection, although it will deny it being appropriate for that purpose, but it mostly is used for holding securement gear (chains, binders, etc) and comes in many variations. Also, the one shown above by GPD, is another example of a header on a trailer, but it too, tends to be used to hold securement gear, but doubles as a header/barricade/bulkhead.