I once heard someone say you can tell where a horse is looking by the head elevation. And, yes, Arabs do have a naturally higher head carriage than many other breeds.
When the horses out in the pasture bring their heads up they are focusing on something in the distance. Same on the trail. If that head come up they are watching. The head is much lower if we are walking along and the nose goes down if they are watching the ground for a puddle, tree roots, whatever.
I would expect an endurance horse going down the trail at a trot to be looking in the distance a bit. I did LD a number of years ago and to me it seems most of the horses traveled as naturally as possible without being hollowed out.
If you ever find yourself in a fair fight, it's because your tactics suck. ~ Marine 1SGT J. Reifinger