Grey Templar wrote:since you must allocate hits on a squadron of different vehicles ONLY the vehicle with the upgrade could take the cover save.
you may be saving points, but one failed save and its gone.
No, a UNIT gets a cover save or it does not. So if 1 model out of 2 counts as in cover, the entire unit counts as in cover.
So a 2 vehicle squadron with one vehicle in 4+ cover (e.g. smoke) will give the entire unit a cover save. If one has 3+ cover, e.g. camo, then the entire unit would get a 3+ save.