Google Checkout and real time shipping rates

I installed Zen Cart 1.3.7.1, Google Checkout mod 1.4.1 beta, Fedex 1.3.5.a.

I configured Fedex mod and USPS for real time rates, which I hoped I could use for GC too, but on GC page for the shipping options I choose I only saw the values I configured in "Default Values for Real Time Shipping Rates" (that mean default 1), and not real time calculated values.

After hours of struggle, I find out and installed Google Checkout mod v1.4.5_CCS, which allow Carrier Calculated Shipping, but that one works only for domestic shipping, or I need it for international orders.

So, can anyone tell me what module should I use and how to configure it in order to have Google Checkout use real time calculated rates from Fedex and USPS?

Any help will be greatly appreciated.

Recommend posting your question to new module support forum.
http://groups.google.com/group/google-checkout-for-zen-cart-mod-support