Yes, bigger is better when it comes to brakes. But so far we seem ok.
Certainly part of the GAWR and GVWR is dependent upon the brake capacity. And I do use the transmission to brake on downhills, mostly because I'm more concerned about the rear drum brakes on the truck than the trailer. We often exceed the Tacoma's GVWR.
By the way, I found a Dexter Torflex Axle catalogue online. It shows that the 2300-3500# axles use #10 mounting brackets which are 10" long, but the 4000-6000# axles use #11 brackets which are 12" long. Mine are 10", so they must be 2300-3500# (hopefully 3500#).
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