Find your next new or used Platinum Coach horse trailer at Coolhorse. Since 2002, Coolhorse has only stocked one brand of all-aluminum trailers and that is Platinum Coach. Early in our trailer business startup, we decided we would only carry the lines of trailers that we felt were the best value for our customers -trailers that we would personally pull and use. We know 'best value" is used by everyone that sells something but what it means to us are these three things when it comes to trailers: 1. Heaviest Constructed 2. Most Eye Appealing 3.