I think about the only thing Trump needs from the RNC is that it put his name on the ballots in all 50 states as the Republican nominee. There may be some value to use of the RNCs infrastructure in the states for get out the vote efforts, but if they try to extort their help, they will be completely shut out of any influence, and they will only force Trump to do it himself, probably better.
Precisely. Watch that video on YouTube about Trump, his plane and his pilot. Watch the way an organization he built at work acts. Then ask yourself what use the childish and corrupt GOP established infrastructure could do for him.
He will brush then aside and marginalize them as fast as he can.