As always, with a project years in the making, a cursory glance can be misleading and B.A.T. is indeed much more complex a project than it may appear:
The Static.inis have been different for each module because of the different vehicle sets: from WWI trucks to modern GAZ types. Worse still, modified vehicle meshes create very different results and can also create save errors because of the different meshes.
B.A.T. uses hard-coded base vehicle mesh changes from Wingflyr, western0221, whitecat, Melissa, Tomoose, vpmedia, SAS~Epervier, MAX_TheHiman, Grieff11 and many others, for specific vehicle enhancements for specific eras. It shouldn't work at all really!
Using the WRONG Static.ini can cause vehicles to show up in the WRONG module without wheels and other odd results.
This has been explained in C.U.P. previously and has only recently been solved for B.A.T.
Specific vehicle data is defined in technics.ini and chiefs.ini, but will often show up in Static.ini too. There are plenty of static vehicles available in stationary.ini but entries also exist, un-necessarily (IMO), in Static.ini. You can't just rem them out and use the appropriate stationary.ini either - this will kill all of the maps!
The obvious point is that Burma '44 doesn't belong in the Jet Age section anyway. We could have supplied a different MAPS.ini for each module but our goal was always to unify the Static.inis - a project which has taken a great deal of work and painstaking care over many months.
Due for release with BATEP07 - We now have it so that a common set of vehicles are called for that don't look odd any more and all of the Static.inis are now the same. Common to all modules are certain trucks and cars whose mesh has been unified across modules and substituted for those times when a map-maker has used vehicles to populate a map.
B.A.T. Expansion Pack Seven, a true milestone, unifies the B.A.T. Static.inis - which means that all QMBPRO missions will also work universally across all modules and all maps will be available for all modules. - Although what wierd and wonderful combination of missions this will facillitate is still to be seen!
BATEP07 goes further to also unify SAS_Engine_MOD throughout all modules. The Modular construction of B.A.T. is key to its functional diversity and success - but it comes with its own set of unique challenges.