One pair of these sections has {TAIL ~ a coupling} 32, with the remaining portions having cooperating ends 34 for removably engaging the fittings 32 for linearly assembling {HEAD ~ each forward and rearward portion} 24, 28 and 26, 30 to form the longitudinal frame members 12 and 14 
One pair of these sections has { TAIL ~ a coupling } 32 , with the remaining portions having cooperating ends 34 for removably engaging the fittings 32 for linearly assembling { HEAD ~ each forward and rearward portion } 24 , 28 and 26 , 30 to form the longitudinal frame members 12 and 14
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH