KKK-S-2768, FEDERAL SPECIFICATION, SEMITRAILERS, BOLSTER, COMMERCIAL, POLE TYPE, 2 TO 20 TONS (20 JUN 1991)

KKK-S-2768, FEDERAL SPECIFICATION, SEMITRAILERS, BOLSTER, COMMERCIAL, POLE TYPE, 2 TO 20 TONS (20 JUN 1991)., This specification covers single and tandem axle, commercial, pole type, bolster semitrailers with or without special load adapters, having minimum capacities of 2 to 20 tons.