I've noticed that the newer Winegard supplied mounting pole is the same one supplied with the original Dish300 and the Dish500's, when Winegard replaced KTI (later acquired by CalAmp, which went defunct due to the DishPro CSS9601 twin fiasco). The newer pole, however is a heavier gauge metal and significantly stronger.
My preferred mounting locatin has always been the corner of the roof right over the corner of the house. This is likely the strongest place on the structure of the house. At this location, the rafter is quite easy to locate, so you are assured that the axis screws of the mounting foot will go into the wood. Even with 1/2 OSB on the rood deck calculating 1 to 1-/2 inch to the outboard screws of the mounting foot, the torsional lever arm is extremely short and sideward tilt under heavy load would not be significant.
I installed dbs systems for over 10 years. To prevent downward swing of the pole, which is the most significant and least resistance as to the degree of free movement, I regularly drive a #14 1/4x20 self drilling and self tapping screw on one side of the mounting foot between the two retaining bolts. In his way, the pole will NOT swing and will NOT depend only on friction to remain its setting. It will be virtually locked in place on the mounting foot. This screw is also an ideal fastener for a UL listed mounting lug.