You are absolutely correct when you indicated you need clear SW skies. I've had similar problems in some campgrounds. With the exception of only a couple this year that had a very heavy overhead tree canopy, I've not had any problems. We reserve our campsites wisely. As we do State Parks and State Recreation Area campgrounds, the DNR web site always has maps of the campground. I will take the time to pull up a Bing.com or Google.com satalite image map of the same campground and study the tree with respect to the campsite and then select the campsite with the clearest SW view. So far, this method has worked great for us.
One thing I noticed, my Tailgater takes a few moments when switching between channels. I have come to the conclusion that the Tailgater must be locking in on the various satellites in the sky one at a time. Say for example, channel 222 uses satellite 119, then 223 uses satellite 110. When changing channels from channel 222 to 223, you have to give it time to lock in. Yes, it's a little slow, but the alternative is NO television programming.
I also have the dish on a tripod that is pointed by hand. I found that to be a terrible frustrating experience, thus the reason for the Tailgater that does it automatically. So I now have both, but use the Tailgater all the time now.