Past two years replaced all the brake lines and gas lines ,primary car is used only for winter but now the rockers are shot,is there a real safety issue when the car is rusty like , how do you know when it is unsafe,car runs great and looks good but the underneath is a question, now jacking up these cars are a problem as well,can anyone add to the question,is it possible the car can break in half. Should I bring it to a mechanic to see if he can jack it up to look under it? Any help would be great.