High Nr is not the only one exagerating here, Dynamic is stretching reality if he thinks an average B2 can work with 1160 Kg (2560 Lb) Granted, It CAN be done, given very low altitudes, low fuel AND an exceptionally light airframe. My B2 experience (with squirrel cheeks and ski baskets installed say they are in the 2800 to 2900 Lb EW range, so given any temperature and altitude, that useful load may drop to 1500 lbs !
The one benefit to a 205, 210 or 212 over a similar lifting B3 is ...SEATS. Not all fire work is just lifting water, many mediums also move crew AM and PM, therefore the 14 available seats vs the 5 seats do make a small difference in overall usefullness.