Like CLaPorte said, it greatly depends on your lifestyle off the trail. Pretty much any dog can go on trail rides that consist of a few miles maybe once or twice a week, given that they are in moderately good shape. If you need a dog that would be willing to be content being lazy around the house for the remainder of the time, I would not suggest a working breed like shepherds or collies. They tend to be very high energy and if they are under stimulated, they tend to get destructive.
I have Border Collies and it is not an uncommon thing for them to be worked for approx. 20-30 miles every 3-4 days in the summer time. They thrive on that lifestyle because that is what they are bred for. Occasionally, you will find one that is content to be a couch potato, but they are fairly uncommon.
Whichever breed you get, the most important thing you can do for them is to ensure that you have a solid call-back. That way, you can call them back to you even if their prey drive is peaked by a rabbit or, worse, a porcupine.