TBC has the ability to drive an alignment but in other CAD software programs, you have the ability to drive the vehicle around wherever. Agtek and Carlson are 2 programs that support this.
The value in this is getting perspective of the model that may not be alignment based. The other value is if you can change vehicles; grader, truck, dozer, you can show scenarios and how work is intended to be performed.
User input; have the user choose the model they want to analyze and this is what the vehicle would use for the height.