I have a medium-sized miner lander with 3300 ore capacity powered by a Poodle and the large Rockomax X200-32 fuel tank. more LF for nuclear, more monoprop when getting low). I have an orbital refinery with two Kerbodyne S3-14400 (largest stock) tanks, a FL-RC1 RCS Fuel Tank (largest monoprop), and a Small Holding Tank for storing ore for conversion to fuels on-demand (e.g. I finally got my Minmus mining operation setup and I'm not too thrilled with the efficiency of it.