I have 2 tintop syncro..
the white 1990 has stock springs and OME shocks front and rear, empty it
sits about 1" taller than 2WD van or westy, 14" OEM alloys rims, General
Grabber ATX 27X8.5 tires.
the beige 1991 has Schwenk springs by the previous owner and I installed
recently HD Bilstein shocks front and rear, empty it sits about 1" taller
than the white van, BFG AT KO2 215/65x16 tires on 16" Borbet rims.
somehow I feel that the ride (both empty vans) on the white one is a bit
smoother than the beige one, fully loaded the difference is less obvious
but it's there. I'd think the difference in the ride is due the the
stiffness of the side wall of the tires (BFG vs. General Grabber) combined
with the age of the shocks - the OME shocks is older than he HD Bilstein.

dan