Hi Jason Parrish,
Each column in RadSiteMap should contain equal number of nodes.To achieve the layout that you want you need to pad the second column so that it has two nodes. The second node should contain no items and should be hidden using CSS. In the end, you will have 3 columns each with two nodes. However, the middle one will actually show only the fist one. The second will be hidden using CSS.
I have prepared sample project that demonstrates the approach. You can find it as an attachment.
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