It looks like the wheels could stay attached to the outside of the suitcase. It means leaving it in the less standard configuration to pull around (landscape rather than portrait) but that can be overcome with a longer handle.

Yeah, if the suitcase weighs 32 kg, you'd definitely want to have some wheels on it!

Or (keeping with the technology available at the time) just go with a foldable bicycle - not as fast, but much lighter and more practical!

Out of curiosity, why do you want pneumatic wheels on your suitcase?

Sound, mostly. But also helps with vibrations if I'm carrying sensitive equipment.

One idea: Buy one of these (https://www.harborfreight.com/150-lb-capacity-foldable-hand-...) and turn it into this (https://images.turnto.com/media/t7kuhATX6jW2ChSsite/5A481415...). If you want to keep it foldable, instead of an axle going all the way through, use either a long bolt or threaded rod, with nuts and lock washers, to attach a smaller pneumatic wheel to each side (threaded rod goes through plastic enclosure, nuts/lock washers keep it locked on either side of plastic housing, wheel fixed on outside with bushings or cotter pin)

Or you could strap your bag to a kayak cart (https://www.amazon.com/Kayak-Cart-Capacity-Foldable-Watercra...)