DT's reason for going to hydraulics over electrics ?

[Diesel-Gypsy]

I am trying to gather the reasons why DoubleTree opted for Hydraulic slide actuators & levelers in 2005 to present models.
The original models from 2003 & 2004 were completely electric as far as I can tell.

Looking at the specs for each model / floorplan the weights haven't changed significantly.
Why was the change made. Did everybody with the electric set-ups have warranty issues?
Were the electrics not strong enough to handle the loads?

I'm sure there are many owners here who can shed light on my search for the "real" reason.

Thanks in advance

Rick