I am going to get back into the export-stuff-into-game business, and it appears I forgot many things and am confused by some new challenges.
Questions I have:

1. LOD
a) From I can remember I need to have one base model and 2 LOD models per vehicle. What is the polygon "range" in which they should fall into, and what determines at which distance which model is used?
My current model I work on has ~ 7k polies.

b) Every model needs to have each moving part as separate objects(Doors, guns, turrets, wheels)?

c) How does this work with LODs, is each LOD model a complete hierarchy of these things?

2. Wheeled vehicles
a) What is different from tracked ones?
b) The wiki speak of "springs". Does the game actually have real working suspensions? I never saw any suspension going on in MOW.
c) When doing collision models, how many polies can wheeled collision boxes take?
d) How do damaged tyres work?