The 2019 MacPro was decided to be modular and expandable but it isn’t just the guts that Apple was referring to. To some extent, it was also talking about how you can turn the cheese grater into a moving cheese grater just by adding four wheels. As with anything Apple, those wheels don’t come cheap but, fortunately, they seem to look the part of a luxurious metal and rubber wheels that will at least sort of justify the price in your eyes.
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https://www.slashgear.com/mac-pro-wheels-kit-photos-show-off-that-pricey-add-on-20617373/