Father and daughter stuck in a mobile home park

Hi im trying to remember a horror film i watched a while ago.
All i remember its about a father and daughter stranded in a american caravan park in the middle of nowhere.
I think one scene was when the girl makes freinds with a boy and they go to a cave and there are loads of tvs there.
And there is another boy who if i remember correctly might be the one doing the killings or atleast we thought it was him.

Ring any bells for anyone?

Maybe Outrage (1970ish) with Robert Culp

I believe it is Far from home