Okay so this is long shot. When I was a kid I watched a movie that I have hunted for over the years. I cannot remember the plot or cast.
What I remember is two children (a boy and a girl) who had to reach somewhere with the assistance of an adult. Somehow they had super powers of a sort. I remember them walking through the carcass of what I would call a huge worm (it reminds me of sand-worms from Frank Herbert's Dune series).
I then remember the ending which is a shot of a flying motor home flying into an amazing sunset scene.
I am not sure if it was a series or movie. The motor home is a generic motor home and not futuristic. I seem to recall that the children made this fly. I seem to remember desert scenes at night. That's it and I hope that someone can help.