Look up by the tv and you will find a BOMB,box of many buttons. If not go by the local Best Buy and tell them just what you need, a source to distribute the tv signal to the other tv's.
Take the incoming signal wire and attach it to the input feed. Take the "tv front" wire and attach it to the box labeled TV 1.
Take the "tv rear wire" and attach it to the TV 2.
Do the same for the center TV and the outside tv and all is complete.
Now when you arrive at the campground and you have cable, you have to do a cable setup for each tv. You have to do this at each campground.