Jack up on axle not the frame for proper re-torque and put a jackstand on the axle as well.
Unless you have air suspension ? then its > Depressurize air 1st then detach air susp leveling link at the control arm.
Now pretty straight forward.
Why you don`t see a nut on the ouside of the frame rail.
The clip/nut is inside the frame rail.
Use a small inspection mirror in the hole (frame ) just rearward of the bolt and you will see it.
Its possible to spray it if you flex a pinpoint plastic straw/tube they usually pack with lubricants.
Remove wheel for access , then in order to use a socket you can either remove the plastic wheelhousing panel or
personally i would cut a small half moon shape to expose a straight shot to the bolt.
An airsaw or a sharp utility knife would be fine.
If the edges are a little ragged you can heat an old screwdriver tip and reform with a propane torch to soften the cut edge.
** Keep torch away from the plastic fuel tank of course! **
Reverse of removal.
Torque arm bolts to 97 lb. ft. ( 131 n.m. )