It looks like the right trailer tires caught the curb, stopped it and it stripped the load. The wrappers have nothing to do with holding the load to the trailer, they only keep the logs from rolling off the top. The wrapper broke after the load came off. There is nothing holding the logs to the bunks but gravity and what is called a cutting edge that sticks up about an inch from the bunk. That is what pulls the trailer down the road, the reach only steers the trailer. The reach could have broke and steered the trailer to the right in this case, you can see it is definitely broke right in front of the car body, or it broke from hitting the ramp. It has a compensator on the front of the reach that allows the length of the reach to change as you go around a corner with a latch to lock it when the trailer is empty. If the force it takes to pull the trailer overcomes the friction that the load has between the logs and the bunk voila, stripped load. It usually happens when getting loaded when you have a partial load and have to go up a hill when the bark is slipping but the shovel is usually handy to reload it.