I haven't had this done yet , but the guy I talked to said he could do it , that the hand valve and others things were not needed. He says there is a safety valve to be put in place between the truck and trailer , other than that , the air supply has to be picked up in the front of the cab. I asked him if it was DOT acceptable, he said it was. I don't doubt his credibility much , he works on all types of haz mat truck , even powder trucks. I'll post picks and the cost of this when its done.