K.D.
I think you'd have to go with a minivan for the vents. We LOVE our 2006 Toyota Sienna. In fact, since we got ours, both my mom and my in-laws have gotten one since getting to use ours when they were keeping the kids. Plus, usually something like a minivan will get better gas mileage, and you can carry bigger things. We've done bunk beds and similar things. Can't remember what all.
Anyway, if you want to really save money, go through an auto broker. We loved the guy who helped us with ours, and my mom just went through the same place. You don't have to hassle the dealerships at all, and you get a much lower price. Example: We bought our van new with 6 miles on it. 6 months later with 15,000 (yes, 15k) miles on it, it was still worth $15 more than we paid for it. Really great deal when you consider the depreciation of a new vehicle. Have fun shopping!