So have you had to install both arcs in your area?
Its not a matter of 'have to'. Its a choice. I take a 1000.2 dish to all of my installs along with an eastern and western arc LNB. I plan all of them accordingly ahead of time with all MPEG4 receivers so that I can use either arc. When I arrive on site I can then choose the arc I want to use based on trees, other obstacles, and customer preference on the dish location.
It makes life much easier for me. In most cases here the EA is easier to hit. 50 degree inclination as oppsed to around 27 to hit the 129. But there are instances still where I need to go WA because of trees. We have lots of heavily wooded areas here with tall pine and oak trees. Many over 100' tall.