Hmmm, the best I could find is
from here, very bottom. He'd want to confirm the tire size is the same though and that the tires installed can handle the pressures though before inflating them that high. If his version is a passenger van it may not have the heavy load light truck tires that those pressures seem aimed at. Maybe that's why the placard doesn't specify, because too many people swap out the tires for comfort versus cargo.
-Rod