Rambler, My sides will be welded, steel panels that will add a lot of strength to the side rails.I have a 14 ft., commercially built dump trailer, and it is built similar to this one and works great. I know why you have concerns, but I think it will work as is. The hinge points will only have weight on them while dumping. This is only a small trailer, but I will keep an eye on the flex points, and add bracing if needed. Thanks for your comments, Greg