36000 lbs on a 3 ton rated wooden covered bridge

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Interestingly, and I'm not a carpenter nor structural engineer, but the deck boards look like 4x10s or so and they span about 3 feet between the next larger structural supports underneath.
 
Interestingly, and I'm not a carpenter nor structural engineer, but the deck boards look like 4x10s or so and they span about 3 feet between the next larger structural supports underneath.
With nothing obvious tying the 4x10 decking together either? I guess a 4x10 of white oak beam on 3' centres would hold 2000lb per tire on big pickup pretty well? But it seems not even the front tires of a dump truck.
We have a few wood deck bridges around my place but they make the deck into a 10-12" thick monolithic slab so if they were to fail, the whole deck would have to break in half at once. The have a iron trusses supporting them so they are good for something like 8 tons per axle, up to 24 tons.
 
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