Capturing current weight on Turtlebot

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Hi,

I am using Turtelbot for my work, and in my setup, Turtlebot is loaded and unloaded with stuff (it is programmed to deliver items), and I do not want the robot to be overloaded beyond its capacity, or even reach 75% of that capacity.

Does the robot publish the current weight currently placed on it? or the weight put on its top? ... if not, is there an alternative? is there some data we can capture and manipulated that would indicate, directly or indirectly, the current weight or the capacity level?

For example, does the weight place on the robot affect its active speed? can can we capture the robot current speed and use it as an indicator for the current weight placed on the robot? ... is there some other data published by the robot, or its /odom specially that can help in this regard?

Thank for your time