Now I don't know how everybody else does it, but here's how I approached getting the body separated from the frame. I put the whole truck on jack stands and loosened up all the body mounts, then set a set of high stands under the bed support behind the rear wells which seems like a particularly sturdy one. My rockers are still off waiting to be blasted, so I spread the weight across the whole length of the torque box with a steel pickup box decking beam on 2 short jack stands per side. Then I set up a gaggle of mini furniture dollies from Harbor Freight on 2 4x6s, jacked up the back just high enough to pull the frame stands out, then the front and dropped the frame out of the bottom of the truck onto the 4x6s and wheeled it out on the dollies. Easy Peasy
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Took 10 jack stands to do this, six 3 ton and four 6 ton, but still, 2 guys, no lifting.