[Zeke]

Depends on what year and axles, doesn't it? I think Carreras have the one piece hub/axle at the outboard end. If I'm correct, I'd tow that one backwards. You don't wan't to tow any Porsche with no rear hubs in place.

Speaking of backwards, if there is no engine the rear wheels will be seriously positive cambered and out of toe alignment. I wouldn't tow a 911 with engine on a dolly forward because the butt will drag at every bump.

Might think about tying the steering wheel and dragging it from the back.