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