Youre absolutely correct about the longevity of the motor driving a 6ft dish. I actually became interested in doing this after seeing just how lightweight the WSI 6ft dish was and fully considered the stress on the motor before attemping. Compared to my 4ft dish, the 6ft dish is only ~3lbs heavier and I could probably drop that a bit making a few addtional changes. I actually have an actuator but was intrigued by the idea of using an HH motor and the simplicity of connections including using USALS. In the end if this doesn't work, the only change I've made to the polar mount is 4 holes in the metal ring and I can always do the install as normal. I've actually had everying assembled with LNB connected and the receiver can drive the 9120 thru my LOS (72-135W). I've acquired an HH120 motor (thanks brentb636) which should allow me to use my current bracket. If that works OK I'll probably stay with it a while although I may end up using a modified bracket as the 9120 speed is better. I should have some time for install tommorow and I'll post results either way.