The Skipper, developed by Zonzini, is considered suitable for use on escalators since the crawler track unloads its weight on multiple points of support, without exceeding the foreseen load limit, providing operator safety. It is equipped with independent crawler tracks that can turn in very tight spaces. The weight is completely unloaded on the stairs without ever leaving traces. It can be controlled with a joystick, and the operator can change the track direction at any time. It is no longer a problem when space in height is lacking.