It's all about this -
2010 New Zealand Fletcher FU24 crash
The operator used standard pax weights, resulting in an MTOW violation. The COG was was also outside the aft limit before the take-off.
"The aircraft pitched upwards until it was almost vertical. At around 350 feet, the aircraft rolled to the left so the nose was pointing down, and dived towards the ground"
Air Samoa operates 2 Britten-Norman Islanders (pax in the low double digits) and 1 Cessna 172 (at last count - 3 pax)
NOW do we all understand why Air Samoa needs to keep tabs on weight?