In the next image the trajectory of the different components of the truck in a bend with reduced radius are detailed.
Simulating software are great because they use real word data: the trucks are equipped with GPS equipment and the movements of the vehicle is registered and transformed in an algorithm that allow to replicate it in your AutoCAD project, with realistic results and cost effective solutions. Use of real wheels independent control.
The point is that there are too many variables to simplify the problem and give a single "one size fits all" value: I suggest using a commercial software such as AutoTURN to estimate the actual additional road widening needed, because the tables provided by wind turbine manufacturers are almost invariably inaccurate and often based on wrong hypothesis. Normally the biggest problems come with the blades. One of the problems frequently found in wind farm project and construction is that road bends with a reduced radius often needs an additional widening to allow the passage of the trucks with the WTGs components.