Yeah, sure, post a link to one of the vehicles it happens with & I'll take a look at it, see if I have the same issue in my game etc
Have you tried installing Corona Begone to see if that fixes it? In OpenIV, hit Ctrl+F3 & search your 'mods folder only' for 'graphics.ytd' & then open it/them & replace the 'corona' texture with the one from Corona Begone in all the files you find.
Also, some screenshots might be useful, just to confirm it's the same issue etc
Corona Begone should completely fix this issue. Not sure why it didn't work for the op.