my 87 F250 weighed #6500 at the cat scale. I evenvstripped it down as much as I could, even took out 1 battery.Had to weigh it to register it. No emissions test for mine in calif.
I'm registered in Arkansas currently. If/when I move back to Washington state, I probably won't need to get smog checked since my Arkansas title shows a weight, even if it's probably badly inaccurate. Over a certain weight for old diesels still require the test in WA.