The two host names of the load balanced machines confuse matters here unnecessarily. The certificate should be generated for transportroster-qa.xyz.net. The private key and other files can be installed on BOTH hosts for the transportroster-qa.xyz.net url.
Without knowing the specific type of load balancer being used it is impossible to go into detail on the configuration. But just know that all of the files that are needed to allow the certificate to work should be installed on all of the machines in the load balancer cluster.