I rarely jump on the trails because there are too many unknowns on my trails. Footing changes from day to day and what if an animal decided to make a burrow right where my horse is going to land? Nah, no jumping for me. If it's too tall for my horse to walk over and too big to move either on or off the horse, I will find a way around. Look harder for a way around. Unless there are cliffs on both sides, there's just gotta be a way! :)
I sometimes go on trails where the downed trees never seem to get moved, so instead the trail gets moved around them!