determining {HEAD ~ a second aligned toe angle} of the second wheel relative to {TAIL ~ a second reference point}, 
relative to
determining { HEAD ~ a second aligned toe angle } of the second wheel relative to { TAIL ~ a second reference point } ,
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH