It's hardly unique to those coaches. Many DP's have that problem because the fuel line is at a very shallow angle and diesel foams quickly and really pushes back. Yes, it's probably worse in hot weather because of the propensity to foam.
The fuel tank is located between the frame and under the floor, but the filler hose cannot be located above the tank without intruding in the house area, so RV manufacturers don't do that. That means the fill and hose run more or less flay to the tank, typically entering at the side rather than the top. This makes a rush of foam very likely indeed. About the only defense is to pump slowly if using the big truck nozzles. The smaller car diesel nozzles usually don't deliver enough fuel flow to cause a problem.
Foam pushes in all directions, so yes it will go out the other side as well. It is also at least 50/50 that the other side is a bit lower, even though the pavement may appear level.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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