Volume in LP tanks not dropping evenly - Forest River Wildcat

by Doug
(Portland, OR)

I purchased a 2004 Forest River Wildcat 5th wheel, and we have been living in it for about 3 months. There is no reliable propane gauge in the trailer & recently I have noticed that when I run out of LP, only one of the tanks is empty.

I believed that since they were manifold, they would draw down evenly. I have been moving the full tank to the other side in order to use the balance of the fuel.

I have not located and valve or switch that would assign the tanks. Suggestions??