An easy way of getting survivors to the safehouse is to use wheelchairs instead of your arms or your back. Just push a wheelchair up to the survivor and wait for them to sit down (they don't have to be injured). When you run the wheelchair to the safehouse you can use it as a weapon knocking down zombies but don't hit too many or crash into too many walls or the wheelchair will break and you will dump the survivor. The wheelchair can also be armed with weapons and used like a tank as shown in the video below.
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