One thing I didn't think to mention when Cromwell was amazed by the "load" of sirens on the Jackson ambulance.
In 1966 the Tyler, TX Fire Dept. bought a spanking-new white over red Pontiac station wagon ambulance. The conversion was done by the Gordon K. Allen Co. in Dallas: the parent company of the too-short-lived Modular Ambulance Corp, whose ambulances were seen on Emergency!
The Tyler fire chief had the ambulance equipped with five Dietz 211 beacons: all four corners and center rear, with the center beacon mounted on an elevated stanchion.
But the sound package is what amazed a lot of people for many years. The chief demanded that the ambulance be equipped with three Qs, and all three Qs had to have different pitches. The salesman at the time for GKA was my late, good friend Travis (Festus) Hagen. Travis told the story of how he and the chief took every single Q that GKA had in stock and went outside the city in a deserted area, and one-by-one went through every Q until the chief got the three separate pitches that he wanted. To power all of that: five beacons and three Qs, the car was retrofitted with twin high-output alternators and twin batteries.
The one and only time I got to see (and ride in) that ambulance was in 1973 after it had been traded back to GKA and then bought by Gold Star Ambulance of Clovis, NM. Sad thing was that by the time Gold Star got the car, the two "extra" Qs had been removed, so it only had the one when I got to ride in it.