Austin,

Main tank (16 US gallons) and auxiliary (10 US gallons). Auxiliary tank is
mounted beneath the passenger side sliding door. Essentially covers the area
from the frame rail to the outer edge, goes from front tire well edge to the
rear frame brace ahead of the rear tire well. Made of Aluminum, it connects
to the main tank through a 1 inch diameter pipe welded to the main tank. I
purchased it from a company in San Diego in 1983 . This was on the occasion
of the gas crisis and was good for a 700 + mile range during my diesel
powered days. Detailed measurements are posted in the archives.

Frank Grunthaner