Dangerous question, considering your sig lists a Ram 1500. You're going to be over the weight limit of that truck waaaaaaay before you ever have to worry about the way to get the most wood in the bed. Think more like half a bed full, if moving green hardwood.
A fleet side pickup bed is somewhere around 55 cu.ft. for a 6.5' short bed, or 70 cu.ft. for an 8.5' standard bed, so 43% to 55% of a cord. Now, check the cord weights of common woods, and you'll quickly see your Ram 1500 ain't moving half a cord of ANY green wood, in safe or legal fashion. In fact, unless you're getting into garbage like Willow, you're not even going to safely move a full bed of seasoned firewood in a half-ton pickup.
If your wood hauling vehicle is a half-ton pickup, and you want to roll safe and legal, you have to settle for moving partial loads or buy a heavy duty trailer. Now, since you're driving in Jersey, that may be irrelevant.