Do they know how many of the 1,251 delegates are Trump always supporters? As I read it, the 1251 delegates are broken down into nine congressional districts, where three delegates are chosen from each district.
At our district meeting, 31 of the 41 delegates were Trump supporters and and I heard that all of the alternates were for Trump. Delegates were elected by the precinct captains.
You are correct. There is a slate of candidates to be delegates to the National Convention signed, sealed and delivered.
The delegates to the State convention were elected April 9th. Application to be on the slate of candidates to the National convention had to be in by April 10th. That slate is full of GOPe stalwarts.
Those delegates to the State convention can only vote on April 30th for the Delegates to the National convention.
Lots of newbie Trump supporters flooded the April 9 meetings. But the need to apply by the next day was never announced to the attendees in my experience.
Lots of ways to dis-enfranchise the voters
“Do they know how many of the 1,251 delegates are Trump always supporters?”
That is NOT knowable.
Some are committed to represent on the 1st ballot, while their true feelings are uncertain.