You pretty much have it right. I would not do it with the truck hitched up. Wood blocks may be required depending on the terrain and how far your legs extend. Jackstands would be a good idea in case of pressure loss. Manufacturer does not recommend, lots of folks do what you are describing.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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