What?

You will get the most room to work if you raise the truck by the frame and
allow the axle to hang. Lift the trick, place your jack stand securely under
the frame rail and repeat for the other side. When the truck is securely
positioned on the jack stands, they you can set to work crawling around
underneath. If you have room enough with the axle and frame where they
currently are, then lift the trick and place the jack stands under the axle
in a position that does not impede your access to the shock mounts.

The -- that's T-H-E -- most important part of this job is "securely". The
jack stands must be positioned to hold the load securely. The wrong way is
the way that lets the truck fall off of the stands.