It's not just a structural limitation, there's also a limitation to how much energy the brakes and tires can absorb. Landing at a higher weight requires a highe

It's not just a structural limitation, there's also a limitation to how much energy the brakes and tires can absorb. Landing at a higher weight requires a higher landing speed, so more energy to dissipate. At very high weights, the tires/brakes will catch on fire during/after landing.