1985 Jeep CJ7 The rear frame is starting to rust out.

Please give me advice on how to cover the already rusted pieces and stop the rust from contionuing all the way through. If the Frame rusts all the way through I will have a major problem. Number one there will be less strnght in the back and number 2 it wont pass inspection. Please, Please help me. I have thought about welding a steel piece around it, but I am afraid it is just going to rust around it. What do you suggest?-Thank you so much -Pat in Virginia