the torque converter can only work with the given torque that its receiving from the pump to the turbine, When you overload the system (like your case) you are only churning the ATF oil, (heating it up really really badly) in the torque converter as the transmission is presenting an increased vehicle load (climb)
You need to drop the reduction ratio down further to increase your given torque, but as you are in the lowest gear, going lower is not possible.
In a powerful engine/vehicle combination with RWD, if you press the brakes fully and apply engine power with shifter in D, there will be a time when the engine power overcomes the brakes and you get a "brake torque" burnout.
In FWD this wont be possible as the front brakes are very powerful by default in any car.