Pony sweating up on trailer

[ahlam1399]

Hello all, I have a 13hh 5 year old Cob Gelding who sweats up quite a lot when travelling (when I unload him his back legs and neck are dripping!), he never refuses to go on the trailer and is quiet as a lamb when travelling, has a haynet to keep him occupied, windows and vents open and always travels with his friend - is there anything I can do to help/prevent him for sweating up? Any help or advice would be gratefully appreciated :)

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