Look it up in the manual, or maybe it's in the fillercap, or a special plate in the door sill.
Inside the door sill on the drivers door there should be a plate listing recommended tyre pressures depending on the payload?
the manual is missing from the van, and there is no info anywhere in or on the van.
front 52 and back 62,
thanks chris, i put 50 psi front and rear this morning just to be safe, phoned the local nissan dealer and that was just a waste of a phone call!! they cut me off after waiting about 10 minutes

As for an LDV# no way!!! lol
not nice vans at all, i've driven the convoy's in the past and they're absolute pants!!