Abstract: A "single drop" semi-trailer is provided including front, intermediate and rear sections. The opposite ends of the center section and the adjacent ends of the front and rear sections included coacting anchor structure operative to releaseably anchor the center section between the front and rear sections, selectively, in high and low positions. When the center section is in the high position its deck surface is spaced appreciably below the deck surface of the front section and substantially horizontally aligned with the deck of the rear section. When the center section is in the low position thereof, its deck surface is spaced appreciably below the deck surface of the rear section. In addition, the front section includes selectively usable landing gear and the center section includes opposite end pairs of opposite side downwardly extendible and upwardly retractable support legs.

Abstract: Front, rear and center trailer frame sections are provided and the front section includes hitch structure for attachment to a towing vehicle while the rear section includes ground engageable support wheels. The front and rear sections include upper deck portions generally horizontally aligned with each other and the front section includes rear vertically spaced opposite side upper and lower mounting portions. The rear section includes vertically spaced opposite side upper and lower mounting portions and the center section is horizontally elongated and defines an upper deck extending longitudinally therealong.