when hauling long distances, I put a 30 gallon trash can with water
about 1/2 full beside their large very large feeder. If two horses two
trash cans with the feeder in the middle. My feeder is a large tree
planter. Everything is wedged in nicely and they may dumk their hay and
then no dry mouth.
My trailor is a stock combination straight load and have all kinds of
room in the rear. I have also fixed a bucket in the bucket holder with
half water.