$aosServiceBin = 'C:\AOSService\webroot\bin'
$packageDir = 'C:\AOSService\PackagesLocalDirectory'

# or
add-type -path (Join-Path $aosServiceBin 'Microsoft.Dynamics.ApplicationPlatform.Environment.dll')
$environment = [Microsoft.Dynamics.ApplicationPlatform.Environment.EnvironmentFactory]::GetApplicationEnvironment()
$packageDir = $environment.get_Aos().get_PackageDirectory()

# it's kind of magic
add-type -path (Join-Path $aosServiceBin 'Microsoft.Dynamics.Ax.Metadata.Storage.dll')
$runtimeProviderConfiguration = New-Object Microsoft.Dynamics.AX.Metadata.Storage.Runtime.RuntimeProviderConfiguration $packageDir
$metadataProviderFactory =  New-Object Microsoft.Dynamics.AX.Metadata.Storage.MetadataProviderFactory
$provider = $metadataProviderFactory.CreateRuntimeProvider($runtimeProviderConfiguration)

# object names
$provider.Tables.ListObjectsForModel('FleetManagement').count
$provider.Tables.ListObjectsForModel('FleetManagementExtension').count
$provider.TableExtensions.ListObjectsForModel('FleetManagement').count
$provider.TableExtensions.ListObjectsForModel('FleetManagementExtension').count

# single object by name
$provider.Tables.Read('CustTrans')