Like Ed, I avoid the high-volume truck pumps, and head wherever possible to the slower speed ones. As many here know, I much prefer Pacific Pride stations, via my Pioneer Fuel membership. There is always high-speed truck pumps, usually with satellite units across from them, and also slow-speed ones to service commercial members such as farmers with diesel pickups or church vans/buses that are diesel.
The way I see it, the truckers commonly have cylindrical exterior tanks on each side of the cab, with open top ports that they can view the fill status through as they pump. A pickup, for example, is a whole different fill port setup of course - unless you have a bed tank with an open top port, you can't see how full it's getting. So a trucker can fill tanks on both sides of his cab at high flow, no problem. On a rig with a filler neck, not so much. And someone once indicated to me that at least some of our coaches have Y shaped fill necks; one from each side joined together before entering the tank.
Going with the slower pumps I find it easier to get the nozzle to run on its own, and listening carefully as I judge it's reaching the amount needed to fill, I usually prevent much foamback. Opening the far side port is likely only to result in foamback out both open ports, losing twice the fuel before getting it stopped.
-Joel
