What an amazing thing to do...my long term goal is to ride endurance...I will look forward to continuing to follow your experiences on HF, and am working to learn all that I can presently about the sport.
The part that really appeals to me is the degree of trust required between horse and rider, not to mention the faith one must have in oneself and one's skill/horse's skill/preparation, (& in God, too, as far as my faith is concerned) to get you through safely!! To even THINK about winning or coming close is just a wonderful bit of icing on the cake, IMO!
You all have the utmost of respect from me for what you are doing (& doing SO WELL!!). Very best of luck in all future endeavors!!
ETA: Amazing photos and video, Phantom! Thank you so much for posting them!!