a receiving tube assembly having a main receiving tube attached to said {HEAD ~ main frame} spaced forward away from {TAIL ~ said rearmost frame cross member}, 
spaced forward away from
a receiving tube assembly having a main receiving tube attached to said { HEAD ~ main frame } spaced forward away from { TAIL ~ said rearmost frame cross member } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH