Some older versions will carry four people.Others are lucky with two.
The very few PA-28 160's still on the UK register dating from the early sixties are the exceptions.
I'm slighty confused by this, I have flown the PA-28-161 (later tapered wing), PA-28 200R (earlier straight wing) and PA-28 181 with both styles. Are you saying that one should only take four in the ones with the older wing, surely if you just follow the individual's aircraft W&B sheet+take off graphs you can't go wrong?