I recently replaced my Motorcrafts with Walmart batteries. Great warranty and price. There is good feedback on Walmart batteries on the various diesel forums.
Motorcraft. I just replaced the original set in my wife's grooming van. It lived in Ohio for 4 winters until I liberated it. I had the dealer put them in because I am getting too darned old to lift batteries above my head while laying on a creeper.
It won't be long before the Beast needs her batteries replaced.