Service Desk Manager has a built-in "load balancer" called Webdirector.
This technical document shows the steps (screenshots) how to use Webdirector with Microsoft InternetInformationServer used as WebServer.
How can I use the Service Desk Manager built-in "load balancer" (WebDirector) with InternetInformationServer (IIS)?
WindowsUSRD 14.n and above
The attached zip file includes the screenshots showing the steps to define webdirector and webengines for IIS