I think the audience at the rallies are chosen so that they're very unlikely to do any jeering, and those that did would get kicked out very quickly.
I do hope he goes on a rant fest, and gets into trouble for discussing a live investigation. Oh please do something even more stupid Trump.
Perhaps they've moved past the 'give him enough rope' scenario, to a full on 'give him rope, a few loaded guns , some matches and a chainsaw... then stand back' scenario