One example that comes to mind is the reduction of shoulder dislocations, an injury that is not uncommon in rough terrain (climbing, avalanche, etc). IIRC that's something an urban EMT would leave to the hospital staff, but in a truly remote situation the PT is better off getting the shoulder reduced in the field.
Some wilderness medicine links:
http://www.pitt.edu/~kconover/ems.htm#top (great resource!)
http://www.soloschools.com/wemtmod.htmlhttp://www.nols.edu/wmi/index.shtmlhttp://www.umm.edu/outdoor/index.html 
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