Yeah, I don't know, seems pretty speculative to me but I've never flown an Otter. IIRC the Feds claim the airplane may have been 38 lbs overweight which most people couldn't tell in a 172 much less a Turbine Otter. The aft CG may be the more important issue but again I'm not real familiar with the Otter or it's loading/flying characteristics, and the people I know who are have only flown them on floats.