The E-350 may only be at 12,500 pounds GVWR, but the rear axle is rated at 8,500 pounds according to Ford specs. That leaves a lot of capacity compared to Jamie's 6,700 pound load. Almost a ton to spare.
Granted if you loaded the rear axle to full rated 8,500-pound capacity you may exceed the 12,500-pound GVWR, but what would that really mean in practical terms? Specs on E-350 and E-450 are essentially the same except for heavier rear axle (9,600-pounds) and springs. Even tires are the same.
It seems some of these ratings are driven by need to meet government regulations more than actual equipment limitations.
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