I've never looked at the mech; but I suspect you have a piston that's leaking.
Like the lift shock/piston used on SUVs I suspect they leak after awhile
The SUVs have two, your truck probably does as well. If it still has some drop resistance, you probably have 2 and need one.
Jacob, the 2014 and up trucks have an Easy Lift and Lower option, I knew it existed but didn't know how it worked.........so, I dug into it
Your right, it does have torsion bars; but it also uses a hinge dampener. I found a YouTube vid that shows how to repair.
The '18 should be the same as this '15
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