10,000lb deck over. I have no idea why so many drivers are proud of hauling more weight that what the rig is designed for. 10,000 will lean less on the corners and curves than the 7,000lb with the same load. The deckover is the only way to haul. Trying to squeeze tires between wheel wells. Or attempting to open vehicle doors between wheel wells. Both are a fool's errand.
As for capacity limits on anything. Tires, electric motors, small engines, generators, cranes etc. Continuous operation at max rated load usually results in early equipment failure.