do I need a satellite cable to hook up my Directv receiver, or will it work with the cable tv cable we use at the campgrounds. I thought they were two different things.
No, you just need the DirecTV box (or a VCR, anything that outputs a channel 3/4 signal) and then run a coax from the Satellite Out connection from the back of the receiver (this won't work with a DirecTV HD receiver which has no coax output) to the Cable In connection on your trailer. Bring up any screen from the menu and you will be able to see a perfect picture or a fuzzy one.