It is hydraulic only shocks.  The gas charged KYBs were to stiff and the rear
of the van bounced when I went over a bump.  I heard the AC housing squeak
when I went over bumps or rough road, after the new shocks that went away
except on the bigger bumps in the road.

Unfortunately the Cofap is only in the rear.  I am getting the Boge for the
front and they are hydraulic only also.

Robert