As it turns out, it's a good thing I went with the Opal. My wife's handicapped ramp van broke, and I had to haul her wheelchair around for a month and a half. If I had bought the Mini, I don't think it would have fit in the back so I'd have had to rent a bigger car. It fit quite well in the Opal.
Her van's been repaired now, but when I priced rental costs for a ramp van I was looking at a couple of thousand USD for the six weeks.
