Does FECC require you to have 13,000 available for freight? That seems a bit high, as my truck weighs 20,000 with 1/4 tank, and has a GVW of 32,000.
I like how Express-1 does it. For a D-unit you need a 20' box and 13k capacity, but they let me by.
I think most trucks push that 20k empty range...