The Min and Max weight levels allow the magento admin to control when the FreightWise Shipping extension can be called.
In some cases admins want user to checkout via Parcel methods if the shipping weight is below a certain threshold. In other cases admins may only want the FW extension to be visible at a certain weight range.
In this example the admin has set the minimum weight range to be 200 lbs. and the maximum to 9,999 lbs.
The weight that is used to determine the threshold is the sum of ALL items in the user's cart during checkout.