There's a thread on here showing 235/85R16 tires, and most of those are also available in 235/80R17, so whichever wheel size you have you can find lots of recommendations in that thread. I don't think the vehicle being a sprinter really has much bearing, aside from if the tires will fit or not, but I don't think that was what you were asking...
If your question really is about fit, you can probably find that info too, but it's just as easy to do a little guesstimating given your current tire size vs. the size you want to run... IMO, "skinny" generally starts with the two sizes I mention above, but that doesn't include the tires posted by billiebob above, which are both taller and skinnier than the typical 235's... I suppose this where being a sprinter might matter.... Because they have noticeably more sidewall height, they might actually be a little iffy for an already tall sprinter. Just a guess on my part...
Personally, I am a big fan of Cooper tires because ALL of their light truck tires are made here in the US, including their off brands. (Mastercraft, Hercules, ******** Cepek, Mickey Thompson, Dean...) I've had a set of Hercules Terratrac AT II's in 235/85R16 that we've run on a couple of our vehicles (Comanche pics below) and they have been a great all around tire. Good enough that I was going to put them on my truck this time around, but I ended up finding a great deal on some Mastercraft CXT's, which are more like the STMaxx. Both of those are a little more aggressive than I'd run on a Sprinter unless I planned a lot of mud duty...
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