MrBrown, in the US care is very fragmented, and each department or region treats their ambulance service differently. I believe the company Jon is describing working for is ONLY BLS, that is, they do not have authorization from the state to provide ALS-level care, and when they employ paramedics, they do so understanding they have a BLS SOP.
Ah nationalisation how I love thee ^_^
Every vehicle here has the same equipment, so, if an Intensive Care Paramedic jumps onboard all he has to take is his ICP bag which has his airway gear and drug roll. A vehicle crewed by two Technicians will have at least one IV kit, for example, even though they cannot use it per-se.
I did have a look at the PA Ambo licensing manualhttp://www.portal.state.pa.us/portal/server.pt?open=18&objID=445337&mode=2 and it looks like the only difference is in the equipment carried, which, is really the same here as an Intensive Care Paramedic will carry intubation gear (for example) whereas a vehicle crewed by say, a Paramedic and a Technician will not.
Not to judge a system I have no experience in, but, it does seem a little odd to me.