Hi,
I found an answer in the forum.
Here's what I did and it works 100% now:
path\to\includes\modules\payment
googlecheckout.php LINE 63
PHP Code:
$this->shipping_support = array("flat", "item", "table", 'freeoptions', 'freeshipper', 'perweightunit', 'storepickup', 'itemnational', 'iteminternational');
Add the custom shipping fields in here like this:
PHP Code:
$this->shipping_support = array("custom_table_one","custom_table_two","flat", "item", "table", 'freeoptions', 'freeshipper', 'perweightunit', 'storepickup', 'itemnational', 'iteminternational');
It works great!!!

Thanks,
Kevin