Hey there,
I cover in more detail several of your questions in a couple of blog posts,
https://livingonthestealth.blogspot.com/2017/01/invisible-in-plain-site.html
https://livingonthestealth.blogspot.com/2017/01/to-keep-on-trucking-really-isnt-for-me.html
I will give you some of the short answers here. I go back a little further than liter-ville. It is a 350 cubic inch engine. I am not sure what that really corresponds to. I am a carpenter and a lousy mechanic. I hire all that sort of wrench turning work done for me so my knowledge down that path line is somewhat limited. It drives great, acts like it could roll down the highway all day long at 70.
General opinions about driving it, the ride is real smooth. Parallel parking, you tend to watch real close for long spots you can slide into. ;-) Turning radius is a tricky thing. One time I had to roll up over a curb to get it to make the turn from the ordering sign to the payment window at a McDonalds. Yeah, I look real close before I get into any drive-thru lines.
I had a job change and the result of which was I needed four nights of lodging per week in the heart of a big city. So for me, I was really into the stealth aspect. I did go for the barn door version, that is what I wanted. I know the sliding door cargo vans exist but I don't think I came across a single used one.
It did have both shelves and a bulkhead. I pulled the shelves out and plan on selling them as soon as I get around to it. I might get enough from those shelves to pay for my solar panels.
It is 28 inches longer. The honest truth of what got me looking at the extended vans was my wife got involved. See I was thinking about a four night a week boars nest in the big city that I might only drive a mile or two a week. Suddenly she got involved and said, "Hey, we could use this as a camper and go on trips!" For two people who have been married over twenty years every inch of extra living space means a little more marital bliss. So I was looking for extended vans, I just couldn't afford one. Where I live it seems like the extended vans are about a four thousand dollar price bump.
But the real reason I ended up with one was it showed up on Craigslist and was the perfect van at the perfect price.
--joe