[Dhuhn]

From the picture of your rig I’m sure you dont have leveling jacks,the jacks in the back are stablizer jacks not used to jack your rig up. The only one that lift the 5er is the front jacks. You need to level side to side first by putting blocks under tires that are on low side. Then use front jacks to level front to back.
You should find a friend who has a 5th wheel hitch to level you side to side so you can drive the wheels up on the blocks. If you use jacks to jack up be careful not to bend any of your axels