Helped try to get an endurance ride in Alaska. ended up putting on LD rides from my house for two years (has to be a 50 miler to be AERC). climate, trails and lack of vets were the main killers of the idea.
Don't overlook the importance of getting yourself in top shape to help the horse out. Foundationtraining.com is a great program for equestrian related activities.
Most of the volunteers work way harder and put in a lot more time than just doing the ride- be kind, courteous, and appreciative of the people helping out -
https://www.sheathunderwear.com/ are worth it.
Good luck and keep us posted
