we used to tow 2 big bales on our calf trailer back in the early 2000's including trailer total weight was probably 1000kg easy.
the old 300's will just keep going so dont worry about making the trailer a bit heavy,
my drawbar and axle is 50x50x5, wheel pattern is 100x4 like my quad and using 250kg springs designed for a jetski.
of course the design is different from yours but the frame will still be the main carrier of the weight
i had a 40x40x3 towbar but that didnt last
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