I have one of those around somewhere. I have never used it and would have to get out a book to figure how.
A better choice would be a 2 stage bottle jack and a jack hook. They are available several places but I would suggest that you talk to Jim K. at
Applied GMC about the different types available. He also has several of them on his web site.
https://www.gmcrvparts.com/category-s/154.htm
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
A better choice would be a 2 stage bottle jack and a jack hook. They are available several places but I would suggest that you talk to Jim K. at
Applied GMC about the different types available. He also has several of them on his web site.
https://www.gmcrvparts.com/category-s/154.htm
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana