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Car trailers are quite a popular means of transport and are offered in
many versions, from single axle light trailers with a maximum permissible weight
of 750 kg, through two- or more-axle specialized trailers. The issues of research car
trailers focus on two directions: testing the driving properties and analysing the
strength of the supporting frame system. Issues related to the construction of light
trailers are often common to trailers used in agriculture or general transport. In this
article, based on a mass-produced car trailer, an analysis was carried out regarding
the choice in the technology of making the supporting structure consisting of a
lower frame and an upper frame. The term upper frame should be understood as the
structure on which the lifted load box rests. The costs of materials, assembly andtechnological possibilities of small-scale production were taken into account. In
addition, strength analyses of the numerical models were carried out for critical
areas of the frame during operation. After considering the unit costs for each of the
analysed assembly technologies, it was shown that riveting would be the cheapest.
However, the most suitable method of assembly is welding, as it allows the use of
standard profiles.