Not sure why motor vehicle would want the unloaded weight. Are you sure they don't want the GVW which is on the manufactures plate on the side of the trailer.
If no one replies by Monday call Jackson Center. If you call JC make sure you have someone that understands your question is for the empty weight not the Gross Vehicle Weight.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles