Movie from the 80's about a boy?

Question

What is the name of the movie that was about a boy and his parents R.V.ing and he was out of the r.v. and hir parents were in it and it went off the side of a cliff and they died. They were in the middle of nowhere and the boy was left alone and an indian came across him that was on his way to die. Do you know the name of this movie?? Thanks

Answer 1

http://www.imdb.com/title/tt0080671/

Answer 2

The guy was not an indian though, that part was played by William Holden.

Answer 3

the earthling