Another way of looking at this is that no 7.3 F250 Tremor will be capable of more than the value listed in this table (17200lbs). This indicates that the lowest possible curb of this truck config is 7120 (not including 300lbs for passengers), but would presumably include the 5th wheel prep. Or, conversely, the highest payload would be 2880lbs, again assuming 5th wheel prep...
7120 + 300 + (17200*.15) = 10000 GVW = 10000 GVWR
10000 - 7120 = 2880lbs
This does not quite achieve the 24900 max GCWR, again, limited by payload:
7120 + 300 + 17200 = 24620 GCW < 24900 GCWR
To get these numbers you would have to order an F250 Tremor with no other options but the 5WP.