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