Your lucky that older cars are abundant and cheap in the USA. Here in the UK there are such stringent laws about the condition of any road transport vehicles. Rust was the biggest problem a few years ago, that's why we've had MOT tests for so long and you have to have a new one each year, except where you have a brand new car and have 3 years without a test. Chassis, body, brakes (pads, disks,pipes,fluid, master and slave cylinders) ,steering, tyres, windscreen, wipers, rear view mirrors just to name but a few. You can even go into an MOT(Ministry of Transport) Test Centre and if your car fails, you get a red ticket and you're not allowed to drive it away, you have to get a tow truck!