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Bilstein's B6 shocks use a monotube, gas-pressure design with a digressive, velocity-sensitive piston that reacts to changing road surfaces rather than damping at one fixed rate. On a heavier motorhome chassis, that translates into steadier handling and less fade on long hauls with a loaded rig or a towed vehicle behind it.
Confirm your chassis and model year against the fitment list before ordering, since shock length and valving are chassis-specific.