I'm like 86Scotty and chose the passenger van specifically for the OEM windows because I have kids.
My first E350 5.4 RB started out as a 12 passenger van. I gave away the 3 benches to members of the forum and replaced them with a single better bench. (There's a separate thread for this, viewtopic.php?f=5&t=10606
.) This is my camping van, has an electric PH and the one I drive the most, about 4K miles per year. The benefits of having windows when not camping become less beneficial while camping. I use some makeshift curtains to cover up all those windows, not ideal but it works for me.
My other E350 is a V10 Quigley RB (um yeah, I have two of these nonPC monsters) and has the OEM 2nd row captain's chairs. I enjoy driving this as my kids enjoy their own individual seats. Its not the camping van and I don't drive it much, about 2K miles per year.
Not to confuse you or to pull you off a tangent but also consider whether you want 5.4/4R75E or 6.8/5R110 or 6.0PSD/5R110. Also consider RB or EB. There's been numerous other discussions about this.
06 E350 V10 Quigley