The Dllingham accident in 2001 seems to be related to tailplane stall. Take-off with ice remaining on the airframe. During climb out the nose pitched up suddenly followed by pitch down and crash.
Interestingly some people teach that the tailplane produces an upload on the Caravan, unlike most aircrafts, and that seems to be valid in this case. Upload or download, could that depend on the CG position for each flight and what is the normal configuration?