Hi Ed. My take on this is that the truss system is really there for stiffness and not for load bearing. The UTA is very light. For that reason I can see where a 6 pole design would work very well.
Don Wyman
Obsession #1166 18" f/4.5
with Argo Navis and ServoCat
WO Megrez 90 APO
Coronado PST