For moving snow with my 782 (aluminum rear) I have about 300# of total extra weight in wheel weights and fluid.
There is nothing about the aluminum rear that makes it any less tough than the iron rear. If the bolts are kept tight and the only rear hitch used is the Cat-0, it is just as durable as the iron rear. Keep the mounting bolts tight and it is no problem. The only real disadvantage with it is that it weighs about 55# less than an iron rear.
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