There is a lot of variation within industry. Smaller units sometimes don’t have enough storage space except for essentials, so it’s difficult to overload them if built on right chassis. Most smaller vans fall in that category. And then there are some Class Cs (B+) built on same 9,350-pound chassis that are over the axle weight rating from the factory. It’s crazy they even make them.
By the way, GVWR (Gross Vehicle Weight Rating) is often much less than the sum of the front and rear axle weight ratings combined. The E-450 is limited to 14,500 pounds, which is only 100 pounds less than 5,000 + 9,600. In the case of the E-350, the 12,500 pound GVWR is considerably less than the 5,000 + 8,500 pound axle ratings. There is a bit more wiggle room, although legally not so much.
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