I find the question a bit too open.
First of all, heavy haulage equipment differs vastly depending on which part of the world it is operated in.
Secondly, even within their geographical realm, they differ vastly depending on the purpose, or rather, the load that is being transported.
Thirdly, they also differ vastly depending on the era you would like to depict.
Could you please be a bit more specific about these things, also whether it's supposed to be moved by a ballast tractor, two ballast tractors, semi, what type and weight of load, etc?