I am certain that Donald Trump and the people at the top of his campaign are very well aware of what is in process and on the way. They are not fools.
What I would like to see is:
1) A public expression of this awareness - preferably by Manafort on some or several Sunday talk shows (let’s let the candidate keep campaigning); and
2) The concurrent announcement of a serious attempt to disrupt AND challenge such cheating. This is not merely the job of the Trump campaign, it is also the RNC’s job - after all, they have both the organization and resources for this, as well as hundreds of candidates (just on the federal level) who will be affected by such cheating.
Maybe the worst of it can be stopped. Whether or not it can, the entire country needs to be aware of this - and reminded about it repeatedly - so that if Trump needs to challenge it, he can do so without being called a sore loser.
Can you remember a time when the RNC ever contested an election even when there is no excuse for not knowing that fraud has occurred? Nope me either.