The implementation of approval envelopes, grouping together the approval of running gear and vehicles, allows manufacturers to build their vehicles that fully comply with braking regulations in France and throughout Europe without having to homologate each trailer. All of these files that we offer are the result of the intense work carried out by the company's Research and Development department. To achieve the production of these sets, the technicians produced a test vehicle, a veritable rolling laboratory, allowing the development of the axles and suspensions before their approval.