Here's the discussion of model building for TW game on the official Russian forum:
http://forums.games.1c.ru/index.php?...msg_id=1942700
And Russian tutorial from there:
http://files.games.1c.ru/_/TOW/Unit modelingTOW ru.rar
I think, there was an English version of it, but I can not find one, unfortunately. Try searching or asking on that forum (you may participate there in English).
Speaking of soft-skin vehicles for SoW, you would have to build also a destroyed version of the vehicle (Armored vehicles don't require it). And you should use LOD_1 of the "intact" version for this task.
Artillery units have to be modeled also in transport configuration, plus damaged state for it.
Parts splitting, LODs and texture usage explained in the tutorial and examples.
PS Models should be built in 3DS Max v.5.1, or older