[_Ogre]

you need the x-member at the rear shackle mounts to keep the frame from flexing at the mounts
you have an x-member at rear and front spring mounts and at the front/rear cab brackets
i used a 20 gal tank similar to washing blue and needed to move the x-member back a few inches
so yes, you still need the rear x-member, moving it is a compromise, but you'll probably never haul a ton gravel
either move it back, i used 2x4 sq tubing going back in, but i also shortened my frame

shock bracket: again this doubles as a brace to keep the frame hump from flexing in/out
if it's not in your way just weld it up, if you need the space, weld in something in front of the axle
use either shock mounts, front or rear. i think they figured out that front leaning forward is better