Giving my skew issue further thought, it is apparent that I do need to consider skew from location to location. I did manage to get all three DISH birds pulled in at my home. On a recent trip, two of the birds keep signal while the KVH maintained a lock on 119W. Not bad when in motion. When parked at the RV site, I used my IPhone app to identify where the three DISH birds where located and calculated the required skew difference from my home location. I set up the Coach automatic leveling system and then manually adjusted the level a few degrees in the coach such that it altered the Dish skew angle. Since it was only a minimal difference, it was imperceptible inside the Coach but it provided enough skew change to allow the dish to pull all three birds in again.
This might help others considering updating their in motion satellite system to pick up multiple satellites without the cost of replacing the in motion dish system. Good luck!!