Hello Bill,
Thank you for contacting us here on the forum.
Currently I may only say that we are looking into it closely to be able to provide support for 5k monitors in the future on MacOS.
In the meantime, most of these displays support side by side pictures by connecting two outputs and this would work on your dock model, provided the output isn't used for another display already.
If you have any further questions, feel free to post it.
Kind regards,
Jakub
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