I can only add that with the big tail and a vertical strake beneath the fuselage, I had enough horizontal vibration/movement to crack the Sterling Polyurethane paint just forward of the vertical stabilizer- on both sides of the strake. No damage to the strake itself or fuselage.  The paint job was about 18 years old at the time, and become quite "brittle" with age.. Reinforced the areas with 2 bid.   With the added weight and surface of the big tail it would seem logical to add a horizontal bulkhead internally across this area, for added integrity..  Just some thoughts for the thread...