I do not think this is a whole number issue ...
Try, for example to only add quantity 17.26 ... which is a weight of:
Weight: 29.9999512lbs
The while you do not see the shipping quote on your shopping_cart page, click to go to checkout_shipping ... and you will see a quote for shipping ...
The issue, I believe is the weight and trying to get a quote for:
Weight: 899.998536lbs
I think it is a total weight issue exceeding some limit in either your code or while freightquote.com not being able to provide you a quote for that excessive weight ...