how do i replace leaf spring shackle bolt and bushing without removing bed

[pjtoledo]

IMO that block on top of the jack stand is a definite no-no, a setup like that will roll/buckle easily.

something like a flat piece of plywood will not try to roll out.

we aren't trying to be hard assed, we're trying to help you avoid issues that the rest of us have been lucky enough to survive.