MIL-S-62183C
(a) The sprung GVW load distribution diagrams
(b) The vertical shear diagram for the length of the vehicle
(c) The bending moment diagram for the length of the vehicle
(d) The loads, sections, shear, and bending members that carry maximum shear and moment, to include the analysis of the stresses in attaching weldments or other fastenings
(e) The loads, sections, shear, and bending moment diagrams at kingpin and rear under
structure subframe members, and for the drop section when drop frame semitrailers are provided
(f) The load, section, shear, and bending moment diagrams for the most critical crossmember, to include the analysis of stresses in attaching weldments or other
fastenings
(g) The loads, sections, and stresses in members that carry maximum compression
(h) Consider all potential structural loadings
(i) List all assumptions and references utilized to provide required data.
3.6 Suspension system. Each component of the suspension system shall have a rated capacity at least equal to the load imposed, measured at the ground, when the semitrailer is loaded with its rated payload (see 3.2.3). Clearances shall be sufficient to prevent interference between tires and any other part of the semitrailer under the operating conditions specified herein.
3.7 Tandem axle. The semitrailer shall be furnished with tandem axles. Axle ratings shall be at least equal to the load imposed on each axle measured at the ground, with the semitrailer loaded with rated payload as specified in 3.2.3. The wheel bearings and axle spindles shall be oil lubricated. The oil viscosity shall be in accordance with the manufacturer's recommendations. The hubs shall be fitted with seals. The hub caps shall have a window and shall incorporate provisions for replenishing the oil supply. The hub caps shall incorporate provisions for venting or equivalent method of withstanding internal pressure buildup without leakage.
* 3.8 Wheels, rims, tires, and tubes. The semitrailer shall be equipped with dual wheels, rims and tires. The rim and tire ratings shall conform to Tire and Rim Association or European Tyre and Rim Technical Organisation recommendations for the type and size of tires furnished. Rim sizes shall be the same for all wheels on the semitrailer. Tires size and load range (ply rating) shall be the same for all tires on the semitrailer. Multi-piece rims shall not be furnished. When specified (see 6.2), disc type wheels shall be furnished.
* 3.8.1 Tires. Tires shall be tubeless type with highway tread. Tires shall be of the steel belted radial type. Tires shall have a rated capacity at least equal to the load imposed on each tire, measured at each wheel, at the ground, with the semitrailer loaded with rated payload. Tires
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