Offboard or Onboard Artillery?

[Weasel]

I also notice that in MBT it can take MANY turns for offboard to CB. Then I think of my poor grunts getting blasted by the enemy guns and say screw it and let go the dogs of war.

So CB isn't a huge issue in my games.

As for on board, any good player will target those tubes forcing the enemy to keep moving them (hint, only shoot one tube at them and it will be enough to make him relocated) or if he stays then bring everything you have and clobber him.

But all in all, a combo of both is never a bad idea.