We have been using Dish in our Caravel
for a couple of years. We use the "Dish Pro" dish, and a stand that I picked up in Quartzsite. Accu-Dish Stands
The stand can be filled with water for weight. It also has provision for nailing to the ground. The top of the pole has a level and a "ball socket" adjustment to make it vertical. Entering the zip code will give you the settings for where you are located. Dish uses satelites 110 and 119. With the proper settings, they both come in just fine. Setting up is a 10 minute job. Having the portable stand allows you to avoid trees or other things in the line of sight to the satelites. A dish mounted on your RV means you have to change location if something is in your way.
Dish network can no longer provide "Local Networks" (the ones you will get at home) when you are more than a couple of hundred miles from home. You must sign up with All American Direct to get networks on the road. All American Direct uses satelite 119. The other stations to which you subscribe are available anywhere you travel in the US, and I think Canada too.
As far as the alignasight, it's handy, but not at all necessary. It merely shows you if there is anything obstructing the dish's view of the satelite. The satelite is, I would guess, about 30 degrees above where the dish is pointing. NOT where the center of the dish is pointing.
High definition with "Dish" comes from satelite 129 and requires a Hi Def box. Whole different ball game.