The rolling methods can only be used on a casualty who does not have an unstable trauma. They are especially helpful for heavy weighted casualties: the rolling does not require much effort, and the lifting itself is done in a more comfortable position (the back of the first responders is vertical). They are also interesting when the casualty is in a very narrow place such as a pit or a ditch: the rolling allows sliding the lifting device (board, flexible stretcher, halves of the scoop stretcher).