This was originally someone else's post that I've hijacked. Original post is below with all the info on it that I remember.

I'm hoping some new eyes / experts can help answer this...

https://www.askmehelpdesk.com/movies/late-80s-early-90s-movie-about-worms-104472.html#post478721

Finally found the answer, so I'll just answer it myself. Again. HaHa
(That's 2 out of 3 now, and my third question is still outstanding)

It's Meet the Hollowheads (1989) - Synopsis (http://www.imdb.com/title/tt0095608/synopsis), aka "Life on the Edge"