I hate to be so negative, but the Aerostar was a giant POS. The Astro not much better. Mini-vans are just sooooo soccer-mom. Probably not any good for hauling a bike either.
A Sprinter is the hot setup, but they can be spendy. A big-3 full size are cheap to buy used with some miles, but seem to hold up well. None are great on mileage.
I would choose a small pickup over all of them. Or a box trailer and pull it with what you've got. I know, a trailer is not nearly as handy, and you have to have a place to park it.
Chris Brown - "The Browneye"
"Without Motorcycles, People Live Very Boring Lives." - Malcolm Smith