I worked as a seasonal employee for a state park service where we did SAR and EMS, but it was BLS and all on foot unless we happened to hitch a ride with a helo. As far as I know, NPS, rural Fire, and rural ambulance services that do things like rope rescue are the best bets for paid wilderness EMS type work. SAR is primarily unpaid simply because the volume isn't there to justify it unless we're talking heavily populated parks and wilderness areas. I left my Parks job simply because we didn't get enough action, so I went to an urban system. I'm much happier. Working where I played kind of ruined it for me.