This addition is intended for fans of unusual traffic and heavy cargo. This addition increased the mass of more than 70 cargoes.
As a bonus, there is a similar archive in addition to Military Cargo Pack v1.6.

The main modes you can download on the website of the author.

P. S. In the process of change in mass intensively used information from the Internet and the formula from school physics course - Mass = Volume x Density, and in some cases used fantasy:).

This mod does not claim to full realism.

Credits:
Author of the main modes: Jazzycat
Author of this addon: Tornado