You might want to consult with your vet about gastric support to help facilitate the change in diet along with the added stress of significant change in environment. This would be something I would continue during the settling in phase when they land in Fla. Have a vet predetermined at your destination if possible. Where your horses are MT oriented, Florida might seem like a whole ‘nother planet to them with all the variances you can imagine. Not a bad thing, but deserves consideration in transition.
Safe trip!! Enjoy the winter : )
Sure there's right and wrong but mostly there's just a whole lotta different.