mine has 422k and the odo stopped working about 3 years ago
I
know I have seen some fishy looking rust in that area. But rust is my SD's major problem. There is a section under the right rocker, behind the front wheel, where I can
actually stick my arm up to mid bicep in a hole between the rocker and floor.. kinda hard to describe... it's got rust real bad.
I
hope to sell it in the spring

I may have to rob it for parts and send it to scrap.