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In today's video I present the construction of a Neptun trailer coupler with a Weima wm900 single-axle tractor. This type of trailer is perfect for transporting light materials such as hay, compost or branches. It would also be suitable for heavier items such as wood if wheel weights were used, because without them the wheels would slip on ramps. 0:00 - Introduction 0:25 - Construction of the coupler 3:42 - Installation of the coupler 5:26 - Road tests 7:05 - Orchard tests for marking small trees 7:23 - Tests for loading and transporting wet hay (compost) 8:56 - Tests for loading and transporting branches 10:18 - Evaluation of the coupler