Torsion type axles (Durotorque) work well when a trailer is constantly loaded to the operating capacity. They are very rigid when unloaded and its really the tyre working as primary suspension then. They have their purpose though on some applications. Like VC said, single axle trailers work best if on a long series spring. Heaps cheaper too. VC has 450kg for this pontoon and I run 600kg on my trailer for light work and to transport the 4 wheeler. Best not to overspring or you're defeating the purpose.
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