Never been up close to one, but the propane tank has to be mounted to the frame of the ban somewhere on the street side accessible from underneath or through a compartment door. Seems like some hands and knees searching and opening all compartments would make it turn up.
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
WBCCI #1811, Region 6, Unit 56