I installed the Van-Cafe 1.5" lift springs some years ago, and use Gabriel HiJackers air shocks on my '86 2WD Westy for load leveling when loaded down for camping, or pulling a trailer.  I've used them for years with great success.  Typically run about 20 psig, and the ride is good.  My drivers side spring is shimmed to level it side to side, so I have a single airline to both shocks.  Running separate lines/valves allows you to adjust side to side level with the shocks if needed.  These supposedly do not fit 2WD vans, and I believe it's due to length - with stock springs, especially sagging ones, unless the pressure is kept up, they will bottom out and likely destroy themselves.  With the taller springs, they work fine on a 2wd at pretty much any pressure.

Keith Hughes
'86 Westy Tiico (Marvin)
 
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 Date:� � Mon, 7 Sep 2015 07:40:49 -0400
 From:� � Eric Caron <ecaron1@COMCAST.NET>
 Subject: Air lift� best rear spring bags
 
 Hi Folks,
 
 � � � � Is anyone out there using the
 Air lift supports in the rear =
 springs� of a Vanagon?=20
 
 � � � � If so do you have a� link
 to the correct ones?� I somehow =
 ordered the wrong ones� and don=E2=80=99t want to
 repeat that mistake.
 
 
 Eric Caron=20
 85 GL Auto Westfalia=20