Have you been worrying about finances lately? Or another area where you feel like you're may be deprived or not get what you need? One theory of dream interpretation is that all players in a dream are really parts of our self. Perhaps your higher self was attempting to reassure you that the Universe is abundant--and that you can trust everything you will always need is available to you.
You could also break down the symbols:
What does America mean to you?
What does your car mean to you? Cars are vehicles--getting us from one place to another. Our bodies house our soul--and is it's earthly "vehicle".
There are many numerological theories swirling about, but off the cuff, 6 often represents "man"--humanity. 2 often represents duality, cooperation, relationship. Are you concerned about a love interest? A relationship? Worrying that you don't "have enough" or aren't "good enough"?
Just some off the cuff thoughts. <img src="/images/graemlins/smile.gif" alt="" />
I've written an article called
Understanding Your Dreams - Be Your Own Interpreter! Perhaps that will give you additional insight, as well.
I hope this helps!