It really depends on the mission and the weapon release restrictions in place. If there are collateral damage concerns, then you may have 500 pound GBU-38s loaded versus 2,000 pound GBU-31s. We tried not to put GBU-38s in the aft bay as those on the upper aft stations had a tendency to pitch down dramatically when they come out of the bay. I think the standard loads varied a lot over the years. A tank or GBU-38s in the forward bay, GBU-31s or GBU-38s in the mid bay, and GBU-31s in the aft bay is viable.
The advantage of the B-1 was payload at range over a long period of time. I alwa