I use my english saddle for everything!
I've never had a problem or anything. But i've only been on 2 trail rides with my saddle. One wasn't too long, as it was just a walk around the property, but we never did it. And the other one was through woods and everything. We did great, but since Vega was so green, she got nervous when she was left at the top of a very steep hill. So I turned around.