This is one of those things you just have to know. I'm not sure where I learned it, either online or maybe from the Master Parts List ( which I would thoroughly suggest getting if you have a WW2 Dodge )
Early 3/4 ton Command Cars came with four bolts, later ones came with two bolts and two eye bolts, apparently there was a retro fit MWO for the early ones. Eye bolts for tow chains were just thought to be too useful not to have. Carryalls were the same, in fact I believe early WC 53s didn't even have a tow hook fitted when they left the factory but the chassis were drilled for it.
Why would you want to tow a Ben Hur with a Command Car or a Carryall? Well any 3/4 ton Command Car or Carryall could be fitted with a full radio set - the WC 58 had one pre-fitted, and one of the most common, and most useful, Ben Hur variants was the K-53 Signal Corps Generator trailer - handy for all sorts of radio use, or to keep the lights on in the officers quarters.