Which outstation (called gateway in brown speak) are you curious about? There’s plenty of parking at most gateways, a small few are problematic but we have workarounds. Never a bad idea to leave a little note on you car explaining your circumstances.
Problem with FedEx is getting back to UPS. Uber always reverts to the terminal = unusable. Lyft or a taxi. Once you get to UPS then you have to enter the matrix a can take up to 20 mins sometimes. Way easier just to catch a brown tail in.