What an amazing community we have. Ask and you shall have answers.
Thank you to Anne-marie for the great question, for those of us that are not used to hauling in the heat.
Here is a great list of tried and tested methods from professional trainers who haul long distances and race in the heat all the time:
-Always use a mask on your horses eyes while hauling even if you have screens – the wind flow creates flying debris
-Always have water in front and use electrolytes if they are drinking a lot to make sure they stay balanced.
-Make sure horse has access to salt
-2-3 bags of cubed ice mixed in the shavings per horse/per stall
-Hose your horses off before hauling and every time you stop
-Don’t use the 1st stall if you don’t have to – not as good of air flow
-Wet Polo/Leg wraps to keep legs cool/supported
-If you have stud wall/full gates drill air flow holes in them
-All windows open as much as possible
-If your trailer didn’t come with bars to keep your horses heads in – you can get screens on amazon – Search Horse Trailer Window Screens and there are a multitude of sizes.