I'm a clever bugger, made some box wheels....since we are going on a trip with plenty of stop overs, long transits, buses and etc. We'll ditch the boxes at our starting point, Athens, mail the plates to and pick up new boxes in Venice.
They're strong enough to for me to be able to sit on the box. That's good, means we can chuck our bags with panniers inside on the top of the box and wheel the lot along like a giant suitcase.
Internal piece with rivnuts, external piece with wheels. One internal end has rubber padding for the forks.
Makes a sandwich of the box, clamped with wingbolts.
Clamped onto the box. The internal plate has double sided tape to hold it in place, there is extra unused for the return trip box, I'll use fender washers and bolts to hold the internal ones when the wheel plates are off, after check in (I don't trust the baggage handlers not to knock the wheels off so I'll remove them)