Seems like there are quite a few different versions/models ....
1) L&W Lift Post 3 Stage (Viking/Coachman)
2) L&W Lift Post 4 Stage (Viking/Coachman)
3) L&W Lift Post Jayco 3 Stage
4) L&W Lift Post Jayco 4 Stage
And just curious ... why do you want/need to know that ? Honestly .. I believe that is mostly factoring on the type and size of the cable used ... which , yes , varies greatly .
Type , meaning like galvanized or stainless steel and the strand count . And size referring to the diameter of the cable .
I.E. ---- say a 1/8 inch cable that has 7 main strands with 19 strands in each of those 7 strands would have a break strength of around 2100 lbs for galvanized , whereas SS would be less ( somewhere around 1600 or so ) and if you went down to say 1 main strand consisting of 7 singled strands within ... then the break strength should be around 2300 lbs
To try and get a better understanding of tensile strengths and sizes and what the cable is made of .... view the following link .
Aircraft Cable Breaking Strengths
( please note , different companies use different strengths of steels used which ALSO changes the tensile strengths of these cables .. so , for an accurate answer , you would need to know at LEAST , the diameter , how many strands ( and if its strands within strands or not and if yes , how many ) along with what they are made of . And at least then you can get a rough idea ...