directtv dish

I'm new to all the terminology on satellite dishes and boxes and all the other things involved. I have read through almost all of the threads on the subject of dish, direct tv, satellite and so on and don't really feel like I have a whole lot more knowledge than before. Direct TV is running a special (which they always seem to be) and was thinking of going in on it with my sister, she can have the direct tv at home and I can have in on the road in my camper. I am assuming that I can take one of the receivers for the home and use that in the camper, then I would just need to get a satellite dish to hook up in the rv. I would like to have a portable one since I camp in areas with trees quite often and it sounds like getting a good signal is much easier with a clear view. There are so many out there to choose from and I would like to know your thoughts on them. It does sound like one that automatically finds the satellites is nice but I also have heard many people state that finding the satellite isn't really that hard and since I will be parked for at least a few weeks at a place, spending 10 minutes if needed isn't a big deal. Is the slimline one a good model, it's much cheaper than many other portables, obviously a bit more cumbersome but that's OK. Thanks for your thoughts and help.
Jon