Yep, I am beginning to wonder if the brake system wasn't added on after market. But the part about the trailer being overloaded may or may not be. Every vehicle is subject to being bottomed out due to a number of factors which do not have to be related to over loading. Virtually every car and truck in service has "Bump Stops" which are designed to cushion a bottoming out condition. This trailer does not. But the fact that they have them is due to the fact that it is possible and does happen overloaded or not. Hitting an unexpected bump will do it quite easily and that does happen from time to time. Whoever installed the brake lines should have accounted for that possibility. And it isn't like it would have been hard to do anyway. Just routing them back behind the axle slightly would have solved the problem. It just seems hard to believe a manufacturer would do something like that. I could see some 18 year old wanna be mechanic at a Trailer dealer doing it though.