PowerCli to pull RDM info

I use the following script to pull matrix from all my vCenter's. We have some RDM's that I want to capture in this as well... is it doable?

When I say capture... Im looking to pull the # of RDM's as well as total space being used by them.

"Total Datacenters: $(@(Get-Datacenter).Count)"
"Total Clusters: $(@(Get-Cluster).Count)"
"Total ESX Hosts: $(@(Get-VMHost).Count)"
"Total VM's: $(@(Get-VM).Count)"
"Total Templates: $(@(Get-Template).Count)"
"Total LUN Datastores: $(@(Get-Datastore).Count)"
$TotalDatastoresCapacityMB = 0
Get-Datastore | ForEach-Object { $TotalDatastoresCapacityMB += $_.CapacityMB }
$TotalDatastoresCapacityGb = $TotalDatastoresCapacityMB/1024
"Total Size of LUN Datastores in GB: $TotalDatastoresCapacityGb"