The reality is that there is always an ambulance/EMT team at any large gathering. Nothing special about that because of Hillary! I’m convinced there’s something serious, probably neurological, wrong with her, but the ambulance doesn’t mean a thing.
That's what I'm thinking, also. It's standard procedure, I'm sure you'll find EMTs and at least one ambulance at Trump's rallies. Instead of being distracted by the ambulance, let's stay focused on Hillary's increasingly common coughing and hacking spells, which are not an ordinary part of a candidate's public appearances.
Parkinsons or maybe something with head injury surfacing again and again. Maybe she is off her medications.