Abstract: A building truss transport trailer device adapted for transporting upright or inverted building trusses. The base of the transport trailer device comprises a horizontal bed frame section, having top and bottom sides and a longitudinal axis. The bed frame section is supported on a set of wheels attached to the bottom side thereof. The bed frame section includes a tongue and hitch member adapted for attachment to a towing vehicle. A vertical support frame section extends from the top side of the bed frame section and is positioned along the longitudinal axis thereof. A fastening system is attached to the bed frame and adapted for fastening a plurality of upright or inverted building trusses, positioned on the bed frame section and against the vertical support frame section, to the trailer device for transport thereof.