Those “fiberglass” trunks, which I don’t think are really fiberglass but just plastic, are really old now and the material they are made of, whatever it is, is very brittle and shatters easily. I wouldn’t use one to ship a harp.
I would also stay away from any wheel transport system that clips onto the rear feet or into the pedal slots. You’d be amazed at how little is holding the pedestal onto the instrument, and many instruments have frames that have shifted and some of the base bolt bushings that hold the pedestal on are loose or have pulled out.