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Throttle joints for carb linkages are available at auto parts stores and came in sizes up to 1/2" diameter threads. I recommend at least 3/8" for light trailers: if you are hauling something more than 100lbs I suggest a steering tie rod end. A heim joint is slightly different in that it has a through hole rather than a male threaded stub.
The next level of sophistication would involve added brakes and suspension to the wheels. The axles can be truss supported for improved strength to weight ratio. Don't forget the aerodynamics especially when touring.
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