Originally Posted by stevehnm
They're always built on some slope, so the water runs off when it rains.
It's not a full size truck with long 35 gallon tanks. I understand and follow your remark about fill slope on my truck when traveling ( usually hauling car(s) to engine builder). But these little 14.5 gallon tanks are so small, I would doubt it would even be a measurable amount, much less after calculating avg