Should be the same as a 2WD pick-up, only bigger.
Can you post a picture? B-in-L sold his 2005 W/H chassis so I don't have it for reference .
Only problem I had changing front shocks on my Freightliner , was, because of the size of the shocks , collapsing them against the gas charge to line up the mount bolts was a struggle. Rears , access was tight , working around the inside dual wheel .