Gross Vehicle Weight Rating (GVWR): Minimum 14,000 pounds. Size: Interior Net Height (including beam width and lighting width): Minimum 7 feet, 4 inches (88 inches). Trailer Width: 8.5 feet. Length: 20-foot box Both the 20-foot box and 24-foot box trailers to be built to work and look the same. Frame: Frame Type: Rectangular Tube. Frame Material: Aluminum (Minimum 11 gauge for frame). Frame Configuration (Spacing on Center): 12 inches of spacing. Nose Type: Flat. Tongue Option: A-Frame (Extended). Front Jack Options: Electric. Ball Coupler: 2 5/16 inches. Wiring: Wire tubing around wires along the inside of frame. Roof: Rounded Aluminum with no seams. Seam: Aluminum (Seamless). Vent: Minimum two (2) Vents Centered Vents must be hood covered and evenly distributed on center. Walls, Flooring, and Doors: Attachment Method: Screwless. Insulated walls, ceiling, and roof. Under Flooring Corrosion-Inhibiting Moisture Barrier. Rubber Tread Plate (RTP) on interior floor and wheel wells. Skin Thickness: 0.05 inches. Street Side Door: Minimum 36 inches X 78 inches - forward placement. Rear Door Type: Heavy Duty Ramp Door with flap and extension Prefer gapless continuous hinge. Flooring Material: Aluminum. Axle, Suspension, Brake, and Tire: Number of Axles: Two (2) (tandem) - 7,000 pounds per axle. Type of Axles: Torsion. Brake System: Electric Tire Size: Must be ST235/80R16 Radial Tire Load Range: Minimum E-10 ply rated. Spare tire and wheel must be included and the same as what on the trailer Cargo and Interior Area: E-Track: Must be attached to frame by weld. Wall Locations: Three (3) recessed tracks the length of the entire wall - On center at 15 inches, 44 inches, 64 inches. Floor Locations: Three (3) recessed tracks - Entire length of floor - Placed on both outer edges and one on center. D-Rings: Attached to frame by weld.