About the Propane tank color, I believe it was a light color, which is
standard on propane tanks to reflect heat and light, but with the VW tank
under the van, not much heat or light gets to it, so I paint mine a dark
color.

My BBQ tank says to certify it each 10 years, so I contacted Manchester
Tank Co, which does the VW tank, and they said that only a DOT tank needs
to be Re-certified.

The VW tank is a ASME tank.  (American Society of Mechanical Engineers),
and does NOT need to be re-certified.

Ed in Md
87 Westy