My wagon is virtually rust free, except for the trunk. I don't know the history of the vehicle. Is this a common place to have rust? Curious
The rusty trunk will be the result of undetected wetness under the carpet. I also have the problem that the lower stowing area was flooded (I think it is because the car repair garage let my car parked with open tailgate window in a heavy rain shower). The carpets are with an plastic rear site but after the years it will be brittle. The fleece under the carpet is in wet condition the best nutrient for rust, molds and bad smell. Fortunately I can say I found only minor rust.
Dear Curious, old cracked and shrunken rear window rubber, along with bad or missing drain tubes in some vehicles leave rain places to leak into the trunk. Also old and cracked trunk seals themselves let vehicles accumulate more water, especiallly in the lower spare tire compartment. That along with many cars I've had there was carpet and a felt padding under it. Add rags, old newspapers and other junk and moisture has a place to do it's dirty work. Junk in your trunk is not always good. Replace all of those rubber seals and use a rust stop paint to stop more rusting.
My wagon is virtually rust free, except for the trunk. I don't know the history of the vehicle. Is this a common place to have rust? Curious According to Curious they do. My 1955 Chevy has a tire shaped trunk in the lower compartment under the floor. This could be called the trunk lid or boot depending where you are. Besides a thinner spare on rim I have wax, California duster, towels, tools and other junk in my trunk. Lucky, no rust.