Get rid of the A-frame and just run a single piece of box section straight back down the middle, it gives you a tighter turning circle which is handy on the farm. You could use the rest of the length of steel for your axle. Lots of quad trailers are built like this.
Use Duragalv steel and zinc paint the welds.
Don't put the axle too far back, you want the trailer carrying the majority of the weight rather than overloading the rear axle of the quad.
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