Unless you provide a barrier, steel on aluminum will corrode. It depends how much you want to spend. I'd expect it to crack again if you weld it.
I'm sure you'll get more suggestions but I'd probably still replace it with a steel angle but put something between the two to prevent corrosion (thin plastic, layered duct tape, silicone). An 80's trailer isn't worth a high dollar repair.
Last edited by Tfng; 07-03-2016 at 08:02 PM.
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