Another thing, one day, many moons ago, I had a bike on the trailer which I only tied down on the front, it seemed stable as. At one point I had to brake hard and looking in the mirror I saw the back wheel lift off the floor about four inches easy, so I had to back away from the brakes a bit. From then on I tie the back down too, just a bit. I try not to have too much pressure on the front either.