Why all the stabilizers on the Beech 1900 airliner?

Question

I recently flew on a Beech 1900 Airliner and noticed several stabilizing surfaces that looked as if they were afterthoughts. These surfaces included two low-aspect ratio ventral strakes on the rear fuselage; two vertical fins extending from the ventral aspect of the T-mounted horizontal stabilizer as well as a supplemental horizontal surface from the rear fuselage. Whose design was this?

Answer 1

Raytheon own Beechcraft aircraft as a subsidary so therefore Raytheon is directly responsible for this mistake!

Answer 2

Raytheon

Answer 3

When airplane was flown it was shown to be unstable which is why surface plates were added under rear fuselage. The vertical fins on the tailplane are added to decrease drag and therefor better fuel consumption to meet performance figures originally quoted by manufacturers

Answer 4

Because Raytheon designed it that way.