There is also the Long Liner, with appearances in CT and early MT.
The FASA ships from that folio range from viable to odd to silly. I'm not sure why anyone would think a single-story cargo bay that wide (in the Triad) would be a good idea. Having to walk through that much cargo bay to get to the shorter catamaran hull just adds to the odd.
The 1kdt Freighter from the Mongoose Core book is clumsy, but for ugly it has nothing on the Hnneshant from IISS Ship Files or the Leviathan Exploratory Trader. Even those Judges Guild boxes posted above could easily be reskinned to look like a diesel electric locomotive and be fine. The Hnneshant, not so much.