Wait...an AED is not required on an ambulance? You must be joking or referring to wheelchair vans or something...if not yikes.
If it weren't for the "unfunded mandate", EMT level ambulances would be required to carry 12-Lead capable monitors in NC! Right now it is optional, and grants were available in the last few years to equip every 911 unit with one.
Dang, must be nice! Correct me if I'm wrong, but in SoCal, aeds are completely optional. The only ambulances that have them are approved 911 providers. And that's by choice.