An Eagle Cap Camper Snapped A Ram 3500 Dually In Half, Mopar Refuses $17,000 Repair Bill

Unless the rust is worse than it looks, a good welder should be able to patch/plate that break.
If the truck is cheap enough, might be worth a try.....
You couldn't pay me enough to fix that frame. The steel these companies use today is to light. That frame is not strong enough to hold what a dual wheel one ton truck like that should be able to carry and mind you its a aluminium flat bed
I had a early 80's GM C30 with a 10 foot steel flat bed, a rack to carry steel, under body toolboxes, full size oxygen and acy bottles, 1500 pound welding machine, plus tools steel cables and there was never a problem with the frame. The frame on that truck was a heck of a lot bigger thicker than that thing that broke, ridiculous how light they make these frames and that's not the first ive seen break at that point
That truck needs a to have the frame replaced, its the only way.