What must you bear in mind when loading a single-axle trailer?

Your answer is fully correct. When loading a single-axle trailer in Germany, you must consider the axle load to avoid overloading the tires and suspension, the load on the coupling to ensure proper towing stability and prevent swaying, and the total mass so that the trailer does not exceed the permitted weight limits. Balancing these factors ensures safe handling, legal compliance, and prevents damage to the trailer and towing vehicle. Always distribute the load evenly and keep the coupling load within recommended limits for stability.