Coach-man wrote:
Cribbing, and jack stands, keep the rig level, fron to back as well as side to side. Never ever get under rig with stabilizers only! Take your time, and as stated use a wooden block to spread the load on the frame, it can bend if all the weight is concentrated in one spot! Last Sumer I inspected/cleaned brakes and replaced inner seals on my rig. I did one wheel at a time, about ½ hour per wheel. Did one side the first day, the other side on the second day. Not a big deal, again don't get into a hurry or try any short cuts! Good luck!
My drive way isn't level when looking at the pictures above, it slopes down to the left. I shimmed the 1st level of cribbing so the cribbing was straight up no lean.