Our vacation schedule got munged by our 300TD getting totaled. I'd take that car on a long trip with nothing more than fuel filters and a AAA card; it was super-reliable and I trusted it.

Now that we just got the 300SDL, we're still thinking of taking a long drive in the next two weeks (3k or 5k miles), from Portland through Utah and Arizona. We've had the car inspected and between me and MBI we've fixed every non-cosmetic issue.

Aside from filters, fluids, and the tools to use them, what else would it be worth carrying? Any pre-trip inspections or maintenance that would be a good idea?

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2003 E320 wagon, ~80k, "Sputnik"
1987 300 SDL, ~160k, "The Pimp Daddy" (sold April 2010)
1984 300 TD, ~200k, "Das Boot" (Demised March 2008)