I was thinking more about when one crew attends and they can’t lift or move a patient like the lady with hoist or the guy a couple of weeks back with the dislocated knee and the narrow staircase.
They then summon another fully equipped ambulance with two more trained medics when what they really need are a pair of burly porters.
A secondary support crew who assist with the logistical problems rather than the clinical problems.
This kind of thing has been tried, and it doesn’t work out as cost effective. You’ve still got to equip staff and fuel the vehicle, the only saving is the (slightly; we’re hardly expensive) lower cost of wages for non clinicians. You then have to keep them utilised for the whole shift. The very specific jobs that they would be useful for come in all over the region, at any time, sometimes four or more at once, sometimes none for hours, sometimes hours of travelling time between them. You would have clinical staff waiting far ages for the humperdumpers to arrive. A double crewed paramedic ambulance is the most versatile resource; it can go to any job, convey anything, and if one can’t do it, two almost certainly can. And there’s lots of them. Better to equip them to manage (pretty much) anything.