OK, I need to modify the site for our particular needs
we list products by the item, but sell by the box, so for every item, the minimum quantity and order quantity are the same, usually 100 or 200, however many are in each box.

Fine, now I'm working on a shipping module that will calculate how many boxes there are and how much each one weighs, but I can't seem to access the products_quantity_order_min column for a given product.

so, shipping module has access to the shopping cart.
I think it reads like this:
$products_array = $_SESSION['cart']->get_products();
for ($i=0; $i<count($products_array); $i++)
{do stuff}

Here's some psudocode of what I'd like:

For each item[$i]
itemWeight * productMinimum = boxWeight;
totalItems / productMinimum = #ofBoxes;
next item
totalWeight = sum boxWeight [$i];
total#Boxes = sum #ofBoxes[$i];

except I can't seem to access product Minimum.
Any ideas?