Hi, @GaryD
Thank you for posting in Microsoft Q&A forum.
After LoadState completes, the new desktop background does not appear on the destination computer. You may check if this helps:
https://learn.microsoft.com/en-us/windows/deployment/usmt/usmt-common-issues#after-loadstate-completes-the-new-desktop-background-does-not-appear-on-the-destination-computer
And according to the official documentation, USMT does not migrate local printers and hardware-related settings.
https://learn.microsoft.com/en-us/windows/deployment/usmt/usmt-what-does-usmt-migrate#operating-system-settings
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You may trace log files to troubleshooting:
https://learn.microsoft.com/en-us/windows/deployment/usmt/usmt-log-files