Oracle has a blockchain for you, and a cloud, and most likely a cloudy blockchain. And it runs much faster without that pesky distributed consensus.
https://docs.oracle.com/en/database/oracle/oracle-database/1...
It's a table. You can use SQL to query it. Now, even more buzzword compliant.
This is the way to go, because your entire IT budget already goes to Oracle licensing fees.
I also don't have all the answers, but thinking more about it, maybe it is the case, that even though there is implicit trust, the third-party freight carriers might not want to depend on a centralised system wholly managed by Walmart? This could be due to opaqueness of such a system.