"Boat spills, truck doesn't."
. This is why your toilet may back up with sewage, but your refrigerator
icemaker rarely does. One hopes.
And I'm point out that I've had several cars that, when filled up, will trip the gas pump shutoff, and as you are putting the pump away, fuel
gushes out of the tank!
Cars and trucks do that when the fill is poorly designed and a load of "cold" gasoline causes the hot tank to contract
and belch the fuel
There are vent line whistles and catch cans and other ways to deal with the boat.