A famous colony game discovers that the world is round… and decides to set off some trade caravans.
Of course, this is natural Traveller fodder, the only question being if the caravan rides alien beasts, or kians, or wheeled vehicles, or air/rafts.
You can always choose something else, like balloon-based trader companies, or even (common enough in the Empty Quarter) repurposed starships.
The jump drives are shot, but the antigrav is a lot more solid! Now, what if we use sails to replace the dead maneuver drives…