I don't think you are going to find a van that fits your needs. Most that are going to be big enough to have the capacity you need are also going to be made in a cargo configuration meaning removable seats as opposed to folding seats like minivans.
I second the pickup with a full height cap on it. I think if you check, unless you get one of the high work-type vans, anything that would fit in a van (height-wise) will fit in the bed of the truck. I would measure the tallest (longest if you lay it on its side) item your wife would need to transport to figure out if it will fit. You may have to go with the trailer suggestion if it is too tall.
