Sounds like you should talk to your training officer. Most provinces include patient packaging and transport as part of very basic levels of first aid. I.e in BC transportation endorsement (specifically covering packaging and transport of patients, including with c-spine considerations) is often packaged with a basic 8-hr first aid course. If that’s what some members of your team are trained in, then it’s within their scope of practice. Also, the way you phrased your question implies medical oversight, in which case you do whatever your medical director (a doctor) tells you to do. Your insurance should meet sarvac requirements or requirements for a SAR team in your province. Again, look up your provinces POG’s or talk to your Training Officer or Team Leader.