Can you remember when the east Anglian ambulance service bought all those American ambulances and had to take them all out of service after a few crashes. Apparently overloaded on the rear axle.10 year old Ambulance with a pooped engine is viable project - new engine/gearbox and off again to save lives.
Next time you are at A&E - look at the reg plates of ambulances - the reason they are so old is - they are silly money new...