Usually the hand brake, I always reverse mine in and leave it in gear now rather than putting the hand brake on if it's going to be left for any period of time.
Biggest problem I had was when I'd put it away wet, driven in forwards and then the battery went flat, couldn't get jump leads on it and couldn't roll it out, managed to charge it in situ in the end despite not being able to get to the front left corner of the car.
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