Bad news bro-- you will not be able to legally use a space heater in your sleeper berth. From the Federal Motor Carrier Safety Regulations Pocketbook: 393.77(6) Portable heaters shall not be used in any space occupied by persons...
that is if they search my sleeper berth....which they can only do with a warrant, since that is my living space.
doesn't matter to me really. it was a gift from a friend. his company does not allow them so he did not need it any longer. it works for what i need. now if i buy one, it will be a cobra.