I use both .38 and .4 so I can see both sides here. I keep my truck and terrain files in their own zips s nothing overlaps. As for black texturing, ive never really had a problem with that as long as I have the -spec files. As far as i know, the only issue ive had recently is the Fuel and Power pump box being black (minor issue). For my opinion, Id stick with the .material files. Also if you ever need anything tested in .4 to make sure everything goes as (textured) id be happy to help.