Who says that fully laden trade ships need to have good jump range? If you want good jump range on your ship, don't fill it to the brim with cargo.
Seems more like a solution looking for a problem tbh.
Because such a ship is already severely handicapped in other ways, including shield capacity, hardpoints and their placement, handling, engine speed, etc etc. Nothing wrong with what amounts to a paper mache cargo holder with an FSD welded onto it if that's its primary role.