This looks like a show bred horse.
I am sorry, but beyond the gorgeous color, I do not see this as a sturdy horse for running across country (eventing). As for competitive trail, brains and temperament matter more than conformation.
This horse has long legs, light on bone, weak gaskins, stands under himself in front, is pigeon chested , has a small hip , a hint of roaching in front of the SI area. Not my cup of tea.
Ick is all I can really say. His overall conformation is very weak and, with his shoulder being upright, his neck tying in so low, and the angles in his entire front end, I imagine he would struggle to get his knees up enough to not be a danger over fences.
Upright shoulder, low neck tie in, light bones, long back, roach back, flat croup, straight stifle, probably clubby on the left front...and he stands drawn up as if he were in pain.
I agree with the posters above. How old is he? In addition to the comments already made he also has something odd going on with his coupling, quite a flat croup and he has a short hip and is slightly post legged. I would keep looking.