Not sure.
Just ask army or marine how they feel when officer tell them:
"Up on that steep hill is MG nest. All you gotta do is sneak and throw hand-granate. Piece of cake!"
Not the same comparison at all.These things are large and can be seen with satellites from space. A strike package would fly out of is range and deliver a salvo of standoff weapons. Boom no more air defense.Yes its mobile but it is still large.