I don't carry bricks around in my pocketsBelieve me I looked around for one but when you're on a busy street in the middle of the city rocks and such like are a bit thin on the ground.
I went to get my wheel chock as well and it was then I discovered that I didn't have one so I used the kerb instead.
I thought the parking prake is supposed to be off when you use a trolley jacy but not for one of these although I'm not sure? Anyway as you jack the rear of the car up the hand becomes less effective.