surely you have a neighbor or somebody that will loan you a jack. you have released that brake on the driveline haven't you. make sure it is loose. I will step aside for ideas from the bigbolt guys, my experience is with conventional smaller car and truck braking systems. they will know a lot more about your brakes than me.
Yes, I made sure the ebrake was released.
I've got a 3-1/2 ton floor jack but I'm pretty sure so it would be maxed out trying to lift the back - don't these trucks wieght about 9500?