We had a 2 horse bumper pull. It was your normal - manger bumps the chest gently, butt bar just behind the tail. We never tied ... because they weren't going to move... but with our slant load we do. We took the 3rd divider out and made it a spacious 2 horse for our 17h TB monster :p. He has enough space to turn his head and touch his shoulder with his nose. I guess he's big enough he couldn't go anywhere, but I suppose I've just got it in my head that with a slant load you should tie. Probably because I've had many ponies in the slant load, that could either get stuck while trying to turn, or even fit under the divider. So ... I also put hay in there, since there is no chest bar ;) If we have a multi-hour ride, we stop every hour at a gas station to offer them water.