a stack carriage bed mounting attached to {HEAD ~ said channels} between said rearward open ends and spaced {TAIL ~ rearward} from said rearmost frame cross member, said bed mounting having a right main pivot pin hole spaced from and coaxial to a left main pivot pin hole, 
a stack carriage bed mounting attached to { HEAD ~ said channels } between said rearward open ends and spaced { TAIL ~ rearward } from said rearmost frame cross member , said bed mounting having a right main pivot pin hole spaced from and coaxial to a left main pivot pin hole ,
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