Specifications include, but are not limited to: BACKGROUND: A custom built 20’ aluminum and steel truck body to be mounted on a State Owned 2024 Freightliner 114SD Tandem axle chassis with an approximate 50,000 lb. GVWR truck with an approximate 155” cab/tandem dimension. The body will have a special heavy-duty floor, sub floor, substructure and special walls and super structures to support a 5,000 lb. workload suspended from the hoist track installed under the special roof structure. Note – Custom-built body: This is a specification for a custom built body. Adding heavy-duty parts to a standard truck body is not acceptable. Note – Dielectric barriers to be installed: Install dielectric barriers between all dissimilar metals to prevent corrosion caused by electrolytic action. Note – Interfacing of steel-to-aluminum joints: Interface all aluminum to steel joints with 3M VHB adhesive or plastic dielectric tape to prevent corrosion resulting from electrolytic action. Note – Fasteners for steel-to-aluminum joints: Install stainless steel bolts with neoprene coated stainless steel washers at the rub rails, and at all other bolted steel-toaluminum joints. DIMENSIONS: A) Inside Length – 240” B) Inside Height -- 86”, Finished height from floor to bottom of beam must be at least 70” C) Outside Width – 102” max D) Overall Outside Height – 93.75” from roof to floor level SUBSTRUCTURE: (All substructure will be constructed of galvanized steel) A) Two – Long sills (3” x 4” structural steel angle or channel,) mounted on the chassis frame rails with 3/4” hardwood mounting strip, secured to the frame with 5/8” U-bolts. B) One – Heavy-duty steel front sill mounted directly behind the front rub rail. C) One – Heavy-duty galvanized tube rear sill welded into the rear door frame structure. D) 29 – 3” x 2” structural steel tube, or 3” c-channel cross-members installed on 9” centers, welded to the floor and the stringers and bolted to the rub rails with 3/8” Grade-5 bolts. Interface steel to aluminum joints with plastic dielectric material. E) Weld gussets to the tubular cross members and to the outboard sides of the stringers to prevent buckling and rocking of cross-members. FLOOR: A) 3/16” galvanized steel treadplate floor, full width, and full length, welded to cross-members. Weld all floor seams full length and full width. SIDE & FRONT WALLS: A) Painted, white, .095” heavy duty extruded aluminum snap lock panel system, with integrated posts on 12” centers. INTERIOR LINING: A) Line sidewalls with 3/8” exterior grade plywood, full height, and full length. B) Line front wall with 3/8” exterior grade plywood, full height, and full width. C) Attach plywood to integrated posts with self-drilling, self-tapping screws. ROOF: A) Tension installed, one-piece, minimum .060” Anti-tear translucent roof sheet, perimeter riveted to the top flanges of the roof rails. B) Glue roof sheet to roof beams with Manus Flex-Weld or approved equal high quality adhesive. C) Install two extruded aluminum vertical corner radii, aluminum roof radius with aluminum cast corners in front covers. SUPER STRUCTURE: A) 3” x 5” x ¼” rectangular steel tubing on 32” centers. B) 1 piece – 3” x 5” x 3/8” steel tube beam, all surfaces painted white. Rear beam 16" forward of rear door header, centered over hat-section side post. Balance of beams of 32" centers. Beams bolted to side roof rail extrusion and anchored to the side posts. This beam to be welded in place as a special high strength rear door frame header. BEAM BOX: A) Beam Box constructed of materials to match the body, tied to body front with support structure to maintain the structural integrity, and extending over cab.
