Specifications include, but are not limited to: The Body is to be installed on a 2021 GMC Sierra 3500HD 4WD Crew Cab, dual rear wheel, and must meet the minimum following specifications. 1. Make & model – Nine (9) ft. Douglas Body model E4FT/23, or equal. 2. Must be constructed with corrosion resistant A60 galvannealed steel, fourteen (14) gauge body, ten (10) gauge floor. 3. Panel doors - Heavy duty fourteen (14) & eighteen (18) gauge double panel, with beveled edges. 4. Hinges - Stainless steel piano hinges, secured to body every two and a half (2.5) in. 5. Panel door supports - Gas struts on all vertical doors and flip-top toolbox lids. 6. Driver Side Front (DSF) - One (1) compartment at floor level. 7. Flip-top lids - only over horizontal compartments. 8. Bed from horizontal and rear compartments must be thirty six (36) in. heigh. 9. Lowered front compartments. 10. Raised front compartments-increased storage capacity of the compartment: raise Curbside Front (CSF) compartment to sixty (60) in. 11. Tapered work platform: work platform to be built with tapered sides, taper to facilitate trailer clearance as best as possible. 12. Round wheel well - heavy duty twelve (12) gauge, one-piece round wheel well reinforced with three quarter (3/4) in. split tube, circular wheel wells. 13. 3-point stainless steel latch system for model E4FT/23, four (4) vertical compartments as well as a lowered compartment, flip-tops, twenty three (23) in. compartment depth. Must have full contact strikers for positive locking to the body in three (3) places for maximum security. 14. Triple seal weather stripping for model E4FT/23 to protect tools and equipment from the elements. 15. Paint - acrylic urethane basecoat to match truck paint color. 16. Weight Certificate - certified weight certificate for DMV registration. 17. LED tail light package, grommet style, nine (9) diode white LED back-up, six (6) diode red stop/turn lights and three quarter (3/4) in. clearance lights package. 18. Headache rack 50/50 (tapered), must have “opening” so that the drive can see clearly through the rear window. 19. DSF compartment interiors, built at floor level for welder platform. 20. Driver side horizontal compartment interiors - mechanic tool drawer, heavy duty formed steel drawers w/dual snap latches for secure holding drawers and long term durability. Roller slides, eighteen (18) in., heavy-duty, two hundred fifty (250) lb. capacity, stainless steel ball bearing roller-slides, compartment dividers DS/CSH.