The support frame 12 comprises {TAIL ~ a pair} of {HEAD ~ side rails} 20 and 22 which are welded to two lateral section members 24 and 26 in a rectangular shape 
The support frame 12 comprises { TAIL ~ a pair } of { HEAD ~ side rails } 20 and 22 which are welded to two lateral section members 24 and 26 in a rectangular shape
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH