I do all four shoes and pads in the front. I'm going there next weekend for a CTR.
I never been, but it was highly recommended to shoe by my friends who did the ride last year. Especially since my mare's feet aren't the best. She is sound barefoot in our native Georgia sand and grass, but she isn't sound on gravel, roads, or rocks despite careful barefoot trimming during her summer "shoe breaks." You just gotta know your horse.
But then again, I'm going to be doing 50 miles at a trot/canter...
I can tell you more when I get back.