Yeah I have done some. Your time between accident s can be long so bring your patience. Take your own supplies that you can trust and keep tape and water handy. For adventure races, remember to use your surroundings to your advantage. Read up on some wilderness first aid for slings and stretchers etc. (depending on how exactly remote you'll be) and encourage everyone that goes by you. I ran a marathon a while back and I know first hand how defeated you can feel, up until some perfect starnger cheers you on!