Side of door? 
i see on the catalog,surf web, all say 32 PSI is best but dunno is
for which size ..but my own concept is that cannot be same PSI for
all size of same tyre but diff size mah...so tats y i cannot find
the best PSI to pump to make the tyre hv best grip or will not flex
so much when cornering.....but if base on a 1.2ton vehicle,mostly
is max 2 ppl sit,wid woofers in box bout mayb 30kg... 
Or rather i ask, who know how much PSI to pump will bring out
performance for Falken RT 215..