Help with the name of this movie?

Question

I don’t know the name of this movie. I think it was made in the late 70’s or early 80’s.

A little boy is on vacation with his parents, and they are travelling in a motor home. They get stuck, and while his dad is trying to get the vehicle out, (both parents are in the winnabego, the boy is watching from outside of the vehicle) the whole thing falls down the embankment and both are killed. The boy must then survive by himself. Any ideas?

It is NOT “My Side of the Mountain”.

Answer 1

The Earthling. 1980