How to decrease the stress of trailering/hauling horses

As with most things, after each experience, you become more comfortable.  I'm always amazed when I meet people that have never had a pet- either as a child or adult.  But animals here on the farm have become "a lifestyle" for me.  That means things that I don't think twice about, such as loading up my dogs in the truck anytime I go anywhere, having the dog ride on the back of the ATV as I drag pastures, or heading out into the mountains with four of five of them is "normal" to me.