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With a regular category B licence, you are only allowed to tow a light trailer. The following counts as a light trailer:
Does the combined total weight exceed 3.5 tonnes?
2300 kg + 1150 kg = 3450 kg = Under 3.5 tonnes
This is an example of one of the driving theory questions at Körtkortonline.se (also in theory tests in Arabic).
There is also a driving licence book online (2023).
More examples of theory questions: