Back to Electrofelon's and other's suggestion to run Meter base (with 3 quad lugs) > multiple service entrance cables > 2 disconnects on the first building and 2 at the house....
I just talked to our local POCO, EPB, who stated that while EPB doesn't get into the number of service entrance cables exiting the meter base, he had been told by electricians that you couldn't have more than two 200A panels off of a 400A service. This was second hand info from him. I have no knowledge about the code on that. I know that in theory, if each panel pulled maximum amperage, which never happens, the POCO line side would be overloaded. What's the rule on this?
