By far the best value out there is U.S Rider.
They're based out of Lexington, Ky. Great value, and they've already proved
their reliability by rescuing my buddy in Massachusetts. Not only will they
tow your vehicle and trailer, they will also make sure there is housing for
your horses should your trailer be inoperable for some reason. They have great
attitudes and are by far the most horse friendly folks I've had the pleasure
of dealing with. I personally haven't (fingers crossed) had to call on them
for help, but was very impressed with their handling of that particular
emergency situation. I think it was 109$ per year if you and a buddy joined at
the same time. Maybe 125$ if just yourself? I thought that for piece of mind
since a lot of us travel alone that was pretty darn reasonable. 24 hr service
365 days a year. usrider.org--phone is 800-844-1409. NO--I DON'T WORK FOR THEM
OR GET ANY COMPENSATION!!!! ( i wish).