Yup.
Most notably I had a fleet of Saturns, which have plastic body panels but the undercarriage goes out. Luckily the first thing to go is the bolt-in engine cradle, and always in the same spot by the driver's control arm, so a buyer can check out a prospective car by just peeking under there. The rear door sills are next, and when they were done, my 247k mile car was also mechanically done.
My plow trucks have been end-of-life wonders. 1985 Dodge w250 had cab/floor rust so bad there was a giant hole where the seat belt bolted to the floor. The seat itself wobbled back and forth until I braced it against what was left of the door frame. Snow blew in through the floor, up onto the dash somehow, so I'd have some sitting on the speedometer when I went out to plow.
Feeling the need for fuel injection, I traded it for a 1990 Bronco II where the rear leaf springs are held in with, IDK, gravity? The loop on one that goes around the forward bolt is more like a spoon, just sitting there. The rear shackles are also garbage. A genuine Bronco II shackle is a few hundred bucks while a Ranger one is under $20, so I got the Ranger and shimmed it with a bunch of washers, LOL. Truck runs great and pushes the snow, and its 94" wheelbase makes it really maneuverable in my suburban scenario.