New to vans
Seating for up to 6 behind the driver row is available in later models of Odyssey, Sienna and the GM triplets - Chevy Venture, Pontiac Montana, Olds Silhouette. I believe the GM triplets are out of production, particularly since Pontiac and Olds no longer exist. I'd give up engine access for a left side door in our Clubwagon. A left size passenger door is a rare option in later model GM full size vans - Express and Savana.
I can't comment on which engines are better. I'll take a Diesel any day even if maintenance access is torturous. I'm sure the consensus is condition is more important than maintainability when buying a used vehicle.
Although non-Sprinter Dodge vans have a 127" wheelbase vs the Econoline's 138", the Dodge seems to need about 10 feet more road width to hang a u-turn. A 6-lane boulevard was often not enough to make a u-turn in one sweep (turning from an inside lane). We had to back into most parking spots because we'd wear out the transmission backing out. The B3500 in top trim level has a noisy cabin - the headliner vibrates against the ceiling and the AC blower is loud. Non-Sprinter Dodge vs Ford, get a Ford. The GM vans come in 135" and 155" wheelbase.
For our purposes there's nothing like commuter van seating vs OE benches. Individually reclining bucket seats with armrests and reading lights shorten road trips. Our B3500 had 10 buckets over four rows and a huge trunk where the 5th row would be. The 5th row stayed at home when we needed cargo space. Check out this puppy - Ford : Other in Ford | eBay Motors - retired from Enterprise's vanpool fleet in SoCal, and this one - Ford : E-Series Van 14 Seat Luxury Captain Chair Van in Ford | eBay Motors . FWIW our Clubwagon has an extra row Chateau buckets in place of the fold-a-bed and a 4th row bench that seats 4. Legroom is tight in the 4th row because of generous legroom for the buckets.
Sixto
93 E150 Chateau 5.8 185K miles
I believe the heads were improved in 2005 to keep them from spitting plugs quite as easily. Service access is not that great, but 100k mile plug change intervals keep maintenance needs pretty low--filters can be reached from the hood, oil changes are no big deal.
I bought my '02 E150 new in March, 2003; it's a mild conversion with 7 passenger spots and factory windows. The E150 as we used to know it (5 lugs) went away in 2007, so everything after that is basically an E250 "lite" with 8 lug wheels.
Our local Ford dealer has a bunch of off-lease 2012 E350's, short body 12 passenger XLT's, for about $20k with very low miles. Great deal IMO, but if you don't need towing capacity, something like a nice minivan might work better for you in terms of fuel mileage and parking, etc.
I have had a full size van (4 of them) since 1986, and am awfully spoiled--we use them for bicycling support, vacations, etc, and they were great for Boy Scouts, family vacations. This will be the last big one for me, I think, unless the new big Transit calls my name. My son is grown, etc.
George
Econolines got the 5.4 in '97 so that's your starting point unless you'll tolerate a Windsor.
Here's a start:
http://raleigh.craigslist.org/ctd/3678162632.html
1994 Ford Club Wagon 15 Passenger Van
2002 ford Econoline E350 15 Passenger van
This one seems lightly used - http://cgi.ebay.com/ebaymotors/261195062456 - and with a 4.9 it probably was

Sixto
93 E150 Chateau 5.8 185K miles
They do NOT go 100K miles before changing!
After 50k they're pretty much done and MPG's tend to drop quicker and quicker as they age, seemingly exponentially after the 50K mark. Add in the COP boots can also degrade causing minor misfire issues its just good maintenance practice to plan on this operation at 50K. As a DIY project on either engine its not too bad but certainly different with the V8 or V10 modular engines, especially those in a van. I can easily reach the back six from inside, the front two from the front. Access is greatly eased by removing the two front seats (an easy operation in itself) but if you don't mind a bit of contortion maneuvering its just not that hard. After your first time you become a member of that club who say its easier than I ever though!
There are quite a few threads in the V8 & V10 forums and I have a list of links to various plug changing specific threads--glad to share that with you if interested. There is a short version too, one I use and have had good luck with so far.
I would add with your stated needs a 15 passenger version might have too many seats. Of course they can be removed and stored if not needed. Just my own $0.02 worth mind ya!
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Sounds to me like a 15-passenger E-series is the smart choice in your situation. Don't discount a minivan completely though, my wife's Sienna has more usable room than my Excursion does. It can also tow!

. The last thing I want to do is start another 8,000 page thread like we had in the SD forum, even though it was one heck of a thread. We had looked at a few excursions but we are already at the limit for what they seat and would end up trading it in on something bigger in a year. So a van or school bus are about our best options
. The last thing I want to do is start another 8,000 page thread like we had in the SD forum, even though it was one heck of a thread. We had looked at a few excursions but we are already at the limit for what they seat and would end up trading it in on something bigger in a year. So a van or school bus are about our best options 
But it seems to me that unless you are independently wealthy (and your van budget seems to indicate otherwise) that you at least consider operating costs here. How the hell are you even gonna afford as many kids as you propose? Braces, shoes, clothing, school books, and even food... What happens if you fall ill and can't work for a period of time? Unless you are gonna start a family sweatshop business and have the kids working for you

Good luck,
George
. Kids really aren't that expensive either. We don't allow them to have things like cell phones or the latest gadgets, we don't believe in tv(all of our activities involve quality time as a family and are generally free) so we have no cable bill and no need for electronic stuff other than a phone, my wife and kids make their own clothes and what we can't make we buy at consignment stores, etc. We grow a lot of our food and make everything from scratch, so food doesn't cost us much at all. It isn't the lifestyle for everyone, but it works really well for us
With all the media attention given high capacity passenger van roll over accidents I'd heard premiums got jacked up. Some states are apparently worse than others.
Speaking of which, maybe Josh should consider a shuttle bus conversion.
Ford : E-Series Van Shuttle bus in Ford | eBay Motors
Ford : E-Series Van Bus in Ford | eBay Motors - ready for those aging parents!
Can you tell from the VIN whether this started life as a passenger van - Ford : E-Series Van BEST PRICE in Ford | eBay Motors ? It has OE passenger accouterments but those aren't OE seats. It would be great to find a 14 seater with center aisle. Then no one's stuck in a middle seat

For the heck of it - Ford : E-Series Van XL Ford Club in Ford | eBay Motors
Sixto
93 E150 Chateau 5.8 185K miles












