you will need a donor piece from a rust free specimen, and hope only the frame rail is rotted and not the inner structure it secures to.

just stop towing with it, and leave it as is.

hopefully you dont have routine inspections in your area, because that wont pass.

 

If this happened to mine, I would be reading it its last rites as it went off to scrap. That ain't safe.

 

I would look over the rest of the car for rust. Rust repair like that is expensive. Because it involves alot of labor. If that were my car I'd be shopping for a replacement. Find an Ody from the southwest or CA that needs an engine and/or trans (from your rusty car).
This is why I use Fluid Film and/or LPS3 rust preventive oils on all my cars. If you were to look under my Ody, it would be covered with fluid film inside and out of each section.
You can repair mechanical and electrical problems but the rust is another story....

 

This is why... AGAIN I plead with owners to use Fluid Film! Not only does it prevent rust, it gets rid of topical rust. And if you have rust it stops the continuation of it. Oxygen (nor salt) cant get to the metal. Sadly your ride isnt safe anymore.

 

everyone is being dramatic... it's just the arse end of the van where the hitch mounts, as long as nobody is towing the risk is marginal.

if it was part of the body/frame where the sub-frame or suspension components secured to, then that would be something to be concerned about.

 

Not dramatic, rear end passengers are at risk if in a collision with a very compromised structure.

 

The area that is rusted is a structural part of the car. It's not just there to hold a trailer hitch. During a rear end accident the back seat passengers are at a greater risk of injury because the structure is now severely compromised. It's up to the owners/drivers of the car to determine if they want to accept this risk not only for themselves but those that are sitting in the rear seats which may include children. If this car is someone's "work truck" then then the risk is minimal.
The structure of a car is carefully designed and crash tested to protect the occupants during an accident.

The rest of the car needs to be inspected for rust problems. I suspect this is not the only area that is rusted. Rust repair is labor intensive and the quality of the work is determined by the knowledge and skills of the shop doing the work.

 

My 2002 was worst than this when I sold it. The frame right under the rear evap drain above the passenger wheel well was rusted out and going forward. Had to get rid of it after a year or so after I notice it