Jim,
Yup...I've widened my search a bit. If it was me making the decision we'd have a Bandit 6"
The catch is that I don't have a dedicated pickup for chips. We have a couple that stay in common use.
The U doesn't buy much used iron so the price is a factor. If I was making the decision I'd buy a used Bandit and mate it to a dump box trailer. It would be quite easy and inexpensive to have a nice unit.
We can dump all of the chips on campus so our drive time is short. A small box would not be a limiter. Even a box that holds a yard would work well. this would keep the whole unit quite compact and light.
But...I'm not in the decision making place.