Thanks Kraivuth,
I think I've been using the terms parallel and series backwards. If I understand your answer correctly, side by side tanks would be hooked up clunk to UAT (parallel) and tanks positioned fore and aft would be connected clunk to vent (series).

I'm installing a tank on each side of the turbine on a new model...previously I've only used a single tank. So, I not used to plumbing for two tanks.

Cheers,
Keith