Now that I'm in front of a PC, here's what I came up with (as usual, YMMV):Jak Nazryth said:.
How large is a typical cargo container?
https://www.dropbox.com/s/6s4l7ls67y0l5mx/Traveller-Freight.pdf?dl=0
They're 30 & 60t rather than the official 32 & 64t, but you get the idea,
Very rough-and-ready, but I also put this together:
https://www.dropbox.com/s/yubse9chfg8d5sh/traveller-freight-drawings.pdf?dl=0