I know a Dodge Ram turbodiesel guy with 1.2 million miles on his Ram. He put an injector pump on it at about 850,000 miles, and a new fuel pump at around a million. Other than that, change the oil, pour in the kerosene, and keep on driving.
I drive a Ram turbodiesel as well. I know it's a bigger vehicle than what you want, but it's given me no trouble of any kind whatsoever. I get 12-15mpg towing a 34' 10,000lb triple axle, and 20mpg plus running solo.
I have a Chevy Cruze Eco for my work beater. I've gotten as high as 51mpg with it, and average about 41 or so on the highway with it.
Anyway, I think it's a myth about the better quality of foreign cars. Maybe once upon a time, but the American brands have had to do better to be competitive.
That being said, my first car was a '72 Dodge Polara that had over 276,000 miles on it before the thrust bearing finally went out of the engine and I had to park it. If you take decent care of it, most any of them will last.
For your little trailer, and what you say you like, I'd say get yourself a new Mustang GT and never look back