However, we at SSAB have always been developing new stronger steel grades. Already today there are grades avail- able with yield strength of 960 and 1100 MPa, which offers new opportunities and challenges in further product development. Although there are new, stronger grades available it does not necessarily mean that they can easily be adopted to the old design concept. Dimensioning of trailer chassis have traditionally been confirmed by years of experience, trial and error and nowadays some FEA-simulations and controlled testing. With the introduction of AHSS the material is permitted to work under higher stresses and larger elastic deflections if possible, but the wish to truly utilize the material employed in the sections finds its limit at any welded joint in the structures. Welded joints are one of the most restricting factors to keep cutting weight of the chassis due to their limited fatigue resistance. Therefore the introduction of post-treatment methods like TIG-dressing or UIT-treatment and alternative joining methods like bolting, riveting, clinching, adhesive bonding and other technologies can help to boost the use of higher steel grades. Development of even stronger and lighter chassis by introducing higher steel grades need a new design approach in which welding is kept to a minimum and where the load introduction permits a good material utilization to be achieved.