Got a new front crossmember and rebuilt the gusset on one side of it. Looks like it had a collision with a mud bank on that side. Bumper had been straightened. Was completely clogged with mud. Probably flexed heavily causing micro cracks to start rusting. Rusted out that side pretty badly. Looked good when I bought it, but after I got the dirt out, it was obviously bad. Now it's over built, and I got to get a look inside the frame, which was completely fine. Nice protective patina, no flakes.
Would likely have been fine for a good long time. But have a winch and winch bumper to mount. Don't need to peel my rover in half.
keep your frame drains clear.