Suspention :

Still using standard alphard adjust shocks.
These are list of aftermarket adjustable suspention:
-Fabulous
-GAB
-Cusco
-Tein
-Tanabe
-A'pex
-Carrot
-RSR
-Bilstein premiun order line
-Sustec Pro
-HKS
-Exclusive Zeus

Air suspention:
-Air Dyne
-Fabulous
-Air Bomber System
-Bold World
-Universal Air
-Skipper
-Sustec Pro
A'pex is more to stiff damper. Fabulous is more to comfort.

Alphard and estima all using independent suspension for the rear. Only TCR10/20 EStima 92-99 using live axle for the rear.

It's TEIN springs, drop 45mm front 60mm back. Comfortable yet solid in corners. Body roll can reduce 40%

lowered springs vs original spring alphard, put them with full load. The margin spring height reduce in lowered spring like my Tein only 20%.
while in Original spring can up to 40-50%.