jc,
you don't say in your post and we don't have these tires in Canada. I may be wrong, but by the price these sound like passenger rated tires.
check the tire sidewall - there will be a 'P' in the size description.
that said, and it being a cargo type van ie:high center of gravity - this van/tire combo even with maximum psi is going to tend to have softer sidewalls. that could lead to less control in an emergency sverve = rollover possibility.
my choice would be tires rated for light trucks, they come with various #plys or load rating. true this have slightly less riding comfort but in turn you may even slighty gain mpg.