Brother Xli aur Gli mein brakes ka koi farq nahi hai both will stop at same distance ABS kabhi stop distance kam nahi karta.
Its not safe to overload any vehicle whether its a car or truck it will negatively effect the braking suspension and engine and could also result in accident.
I think the max weight of new corolla is less than 1600Kg which means if we minus the vehicles own weight of around 1100 kg for Xli it will have around 500 Kg.