G.B.
So you're looking for a stroller that will carry 4 children? 2 preschoolers and twin newborns?
I suggest you go to some child care supply sites and look at theirs. We often got super size strollers for the baby room so they could strap them all in and go for walks and stuff. BUT they don't fold up, go in vehicles or much of anything except sit in a storage area then go outside for walks and stuff.
But I'll see what I can come up with by googling child care resources.
I was surprised at how many different multi child strollers there are out there now that do fold up and are much more convenient. I guess you do have a lot of options!!!!
This is the style we had in child care.
http://www.daycarefurnituredirect.com/catalog/item/948238...
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Walmart has 2 different styles for 4 children at once, one is $399 and the other is $491. That's quite the investment but at least you know Walmart is right there if there was a problem with it and they do have a somewhat good return/exchange policy. They do even have one for 6 children....
http://www.walmart.com/ip/Angeles-SureStop-Folding-Commer...
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Then there are some other stores.
http://www.appliancesconnection.com/foundations-###-###-#...
Here's a site that reviews things like this. Perhaps they can shed some light on issues you might have seen.
http://www.foundations.com/quad-strollers.html