Home - Trailers - Trombones - Straight Frame Extendable Trombone TrailerStraight Frame Extendable Trombone TrailerDennison’s Straight Frame Extendable Trombone Trailer comes complete with air operated locking pins and a Keruing hardwood floor as standard. Its ENXL certified headboard has been tested up to 17 tonnes.FEATURE AND BENEFIT SUMMARYExtends to 21.2 m when fully open – can be used for operating within standard C & U Regs or on special types for over-length, indivisible loadsAir operated locking pins – includes 1500mm opening intervals for different load lengthsENXL certified fixed flush headboard – tested up to 17 tonnesSockets and posts – for load safety and securityGalvanised post trays – storage for posts when not in use29mm Keruing flooring – durable and hard wearing