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Sounds like you need a way to select tow mode when the battery has run out. I bet there is a way. You wouldn't design an EV without it, would you? Perhaps a case of RTFM. But maybe the manual can only be displayed when the battery has some juice? Some things need to be on paper.
nick_h.-
Seems pretty obvious
To start, you’ll need to open the fuse box in your vehicle and locate the “N” brake-shift interlock relay. Next, depending on the model of your Tesla, remove either one or two relays from their clips.
You’ll then be able to slide them down so that they are free from their clips. Now insert two small paper clips into the two holes for each relay.
Admittedly loads of different methods came up, all with no reference to model or anything. Definitely not what you'd want if you'd broken down in the middle of the road (or car park ramp).
aggi
Teslas have a tow mode which disengages the brakes and motors to allow the wheels to spin without resistance.
I assume most other EVs have exactly the same.