Thanks for your reply Scott33.
However a lot of the issues you have raised are to do with emigration. The difference between emigration and exchanges is that you dont actually/officially take a job in the country you are moving into. The exchange needs to happen at exactly the same time with the backing of both ambulance services. Each person taking part in the exchange remains employed by their current employer. Its kind of like a busmans holiday (dont know if you have that term in the states), it just means a working holiday.
In addition, with regards to accomodation, the exchange can only work if both parties agree to basically swap lives, i.e. houses, cars, etc, etc. obviously have to draw the line at partners as that idiot posted above, but everything else though.
I agree it will be a logistical mountain, but I have met many people who have undertaken this kind of thing and not only to the US but other places further afield like Australia and they have found the pro's far out weigh the con's
Cheers
Dan