Safety inspection system for trailers, comprising - a protective wall for forming an inspection route to the run of the trailer, - an imaging system with radiation technology, which carries out a security inspection of the trailer passing through the inspection route, and - feed means (7) for conveying the trailer, characterized, in that - a window of the horizontal detector arm (3), from which detector modules (4) in the horizontal detector arm accessible opens downward and a horizontal door (10) is covered, and - a window of the vertical detector arm (6) are accessible from which detector modules (4) in the vertical detector arm, opens to an inside of the track and from a vertical door (11) is covered.