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Knowing basic first aid skills - including CPR should be a minimum level of skill. WFA/WFR are great if you can make the time. An AED can be an incredibly useful tool but may be of limited or no use in the case of cardiac arrest due to trauma. The arrest is almost always due to injuries that result in a heart rhythm that is not shockable. This does NOT mean you should not make use of the tool since you can't know if a shock is warranted or not. Traumatic arrests rarely have good outcomes unfortunately and it is even worse in a remote location with extended evacuation to definitive care (a hospital). You need to be in a position to provide stabilization and address items that are an immediate threat to life until a higher level of care can be provided. In my experience, the actions of a friend or passerby with first aid skills has prevented death or disability in several instances.