As you may or may not know it is illegal to put any class 1 explosive on a truck with a "cargo box heater" unless the unit has been disconected and the fuel tank(s) drained. Since I have no good way to do this I have taken our "explosives flag" off of the truck. I might understand not running the unit with explosives on board. I could even go for an electrical interupt switch on the reefer that would prevent the unit from being started from inside the truck when loaded with explosives. I don't understand draining the tanks. IF I had a seperate tank that I could drain, where would I dump 60 gallons of diesel legally? What about the fuel filters? You can't just throw them away. I hate giving up a potential source of revenue but I can't afford to run out of compliance. I can only just begin to imagine the fine for running illegal on an explosives load. Layoutshooter