There are also some highly rural EMS services that, while they are not only "wilderness" you will do your fair share of hike in rescues and some back country rescues, EMS calls on trailheads, along rivers, or remote campgrounds. Look for a service that covers an area with large national forest areas. National Forests do not have their own EMS, only national parks. So when someone calls 911 in a national forest area, the local EMS agency gets the call. As for California, where I am from, Sierra Ambulance in extremely rural Madera County, Liberty Ambulance in rural Kern County, and several others come to mind. . Those cover thousands of square miles of National Forest areas and Wilderness areas as well.