The Whole Earth Family truck, originally uploaded by swanksalot. (click to embiggen)
A vintage Dodge of some sort (Town Panel, circa 1961-1966). There was a green paint on top of these letterings for many, many years, but the green paint has gradually flaked off, leaving the lettering exposed again.
www.ragnarokr.org/index.php?title=John_Anderson
I’ve uploaded a bunch of photos from my trip, here