Referring to FIG 3, when the back leg supporting surface 122 is at a higher elevation than the ladder element supporting surface 124 the length of the back leg assembly 26 can be shortened to maintain the ladder element 24 at a ladder angle 38 within {HEAD ~ a range} that provides {TAIL ~ good stability} 
provides
Referring to FIG 3 , when the back leg supporting surface 122 is at a higher elevation than the ladder element supporting surface 124 the length of the back leg assembly 26 can be shortened to maintain the ladder element 24 at a ladder angle 38 within { HEAD ~ a range } that provides { TAIL ~ good stability }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH REL TAIL TAIL TAIL TAIL TAIL TAIL