I have an 05 LSV and plumbed in a 440lb sack in each v-drive. It overflow fills from the factory (under the floor), and gravity empties back into the factory to exit the boat.
We also use a 600-700 on the floor and 2 250lb sacks in the bow. The wake is really big, great shape, and fun to ride. If you want the lip a little more abrupt, don't weight the front as much. If that's your preference, you have to have some hole-shot with all that weight in the back of the boat.