You tongue-weight scientists need to sit back down.
The truck had its frame welded on in the center where it failed. That’s why it failed.
There’s absolutely no way a camper and a trailer with a tongue that long would break an F350 frame, and then an F450 frame.
The reason it bent upwards is axle torque. The axle is trying to twist the opposite way the wheels are rotating. That’s why drag cars try to lift the front on launch.
My own setup is just like that. 11.5 camper on a dually, three different ones over two decades, with a 10,000 pound trailer with an extended tongue, no hitch extension.
My frames don’t fail because my tie downs are bolted on, I haven’t compromised the frames by welding on them in the middle.
You couldn’t put enough tongue weight on that truck, with a trailer tongue that long, to break it and if you did that’s not where and how it would fail.
