29067 OSCOMMERCE Freight Calculator

I have an oscommerce store that sells large items. They can not be shipped via regualr ups or fedex. These items must be shipped by truck. I need a module that can automatically calculate the cost of freight from Canada to Canada and United States. Example of size of items would be 75" long x 40" wide x 59" high and weiging 300 lbs. The module must automatically calculate the cost of shipping this, and also calculate if 2 or more are ordered what the shipping would be. Please post detail of what you can do in PMB