a stack carriage bed assembly pivotally connected to {TAIL ~ said bed} mounting by two bed pivot pins inserted in said {HEAD ~ main pivot} pin holes, 
a stack carriage bed assembly pivotally connected to { TAIL ~ said bed } mounting by two bed pivot pins inserted in said { HEAD ~ main pivot } pin holes ,
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH