This is desirable as frequently {HEAD ~ the opposed sides} of the tractor will deflect in {TAIL ~ opposite directions} 
deflect in
This is desirable as frequently { HEAD ~ the opposed sides } of the tractor will deflect in { TAIL ~ opposite directions }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL