INFO ON UNBRAKED CARRIAGE
An unbraked trailer may have a maximum total weight of 750 kg. This means that if the trailer weighs 200kg, you can load 550kg. Before choosing to buy an unbraked trailer, you should check that the car is allowed to tow this trailer on the Swedish Transport Agency's website (See the link below, not all cars are allowed to tow 750kg unbraked). If the car can pull this trailer, you can drive at 80 km/h, should it be the case that the car cannot pull 750 kg, you can only drive the cart at 40 km/h when it is loaded. You can then choose to buy the same trailer fixed at 650kg instead.
The carts are tax-exempt and the first inspection is after 4 years (then every two years).
You can check the total weight your car is allowed to tow here (details can be found under technical data --> coupling device):
Vehicle data with registration number 
The Swedish Transport Agency's trailer calculator
