If I may chime in, just had a FCAR out of DTW. When I called and said I wanted a pick-up from the Hertz DTW location, the lady was extremely professional and sent the pick-up van within minutes.
She also noted my Sixt Platinum status, and offered me the Platinum upgrade without me even asking. Got a 2015 MB CLA 250 (PCAR). I'd have preferred the A3, but they didn't have that on their lot, and the lady was so nice and apologetic because of that (mind you, the reservation was made about 5 hours before picking up...pretty last minute!).
So, there, some of the nicest agents I have worked with, at Sixt are in DTW! From a PCAR, as a Plat, OP should atleast receive an LCAR. It never hurts to call the location in advance and request the Plat upgrade (and also inform them of the pick-up time from DTW)! Safe Travels!