Guess there are several ways to determine how much to put in each compartment. I try to balance the load as much as possible by first adding the sum of max cargo in both compartments (call it Total Cargo). Then I divide the max cargo of the forward compartment by the Total Cargo to get the percentage of cargo that would go into the forward compartment. I do the same for the rear compartment. For example, in the CRJ7, I would take your 2,500 lbs and multiply by 0.2419 to get 605 lbs which I enter in the forward compartment. Doing the same for the rear compartment results in 2,500 lbs x 0.7581 = 1895 lbs.