Download and unzip to access all trailer parts ready for 3D printing.
To complete your trailer you will need to find 4 x Lego Technic or Mind Storm wheel type - Lego Part Number 56145 (30.4mm dia x 20mm). The Yas in Schools official trailer axle has been designed for direct fitting of these wheels. See below picture.
Download and unzip for accessing the complete official trailer assembly in .F3Z and .IGES CAD file formats