cmcdar wrote:
LIQUID SURGE
Liquid surge results from movement of the liquid in partially filled tanks. This movement can have negative effects on handling. For example, when coming to a stop, the liquid will surge back and forth. When the wave hits the end of the tank, it tends to push the truck in the direction the wave is moving. If the truck is on a slippery surface such as ice, the wave can shove a stopped truck out into an intersection.
http://transcourt.com/blog/2015/03/05/liquid-surges-in-tankers-can-be-deadly/
Those things, on average, carry 9,000 gallons. So, assuming we're talking about liquid surging, we'll say the tanker is half filled - 4,500 gallons.
4,500 gallons is just a little bigger, just a tad more, than your "large" fresh water tank of ~100 gallons (Which, if half full, 50 gallons, obviously) on most RV's.