F-150 or Mercedes

I have two vehicles. A Ford F-150 pick up and a Mercedes C-300. Both are in good shape. Which one do I take to the M&G? I have not been taking the C-300 because I don't want them to think I am super rich. At the same time the bible says something about hiding a lamp under a basket? What does everyone here think? Or am I overthinking and it does not matter.