What is the name of this movie?
I saw this movie on television once a long time ago when I was a little kid. Trying to remember the details as best I can, it was about a family travelling in an RV, I think on vacation. They meet these people that turn out to be part of a murderous cult. The cult stalks the family as the family tries to escape. I can't remember how it ends, but near the end I think I remember the family's RV running out of gas or losing a tire or something that allows the cult to catch and surround them.
I think I was in kindergarten when I saw this movie on television so it would have been around 1984. I also seem to remember the movie looking old at the time, so I'm figuring it was made in the 70s. Anyone have an idea what movie this is?