also be wary - as the Horse in general is still one of the buggiest parts of the game, and will likely be so for a few updates until more important aspects are hammered in and ironed out.
If you, for example, ride the cart - You may end up with player rotation being off and/or player sheet being inacessible - both can be fixed with the same save fixer program, and in general, both (the player rotation and horse freakout/rotation/etc) are caused by the horse