left hand corners

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We have just brought a new horse home. He had never been in a trailer before but loaded ok after a very short pause for thought. Travelling was fine except for left hand corners. It doesn't matter how slow you go he obviously leans and then loses his balance. We had another horse years ago who did this but was fine without the partition. We will take the partition out next time but wondered if anyone had another solution because we were hoping to take both horses together sometimes.
Does anyone know if those bumpers that go inside are any good?