Hauling livestock is a little different than dead loads. Horses need H2O and should only be on a trailer for no more than 12 hrs +- max.
Also, for commercial haulers there are laws about getting them out and moving them (either leading or turning loose).
We had a problem horse had to transport her twice, pitching a fit, and had to get ride of her due t oour bad neighbors who cant mind there own or stay on their own side of the fence.
My wife shows Tennesse Walkers. A majority of the miles on my truck are from pulling the horse trailer (2 Horse w/ Dressing Room), or something to do with the hay burners.