You can overcome power with gearing (and vice-versa
)
My brother researched and researched before buying a Sprinter, but then he drives it at 45 in the mountains... sigh. He did stick with the 3.73s the Sprinter had on the lot, although he had originally planned to change over to the 4.10s if there wasn't enough power.
Don't forget the Ford vans are detuned, my 6.0 is nothing like my 7.3 simply because the former is in the van the latter in my pickup. I think I could out-tow my brother's Sprinter still, but I don't see it as a reason to not buy the Sprinter.
Have you found anything definitive that it
won't work for you?