I am thinking on using a 47-48 fuel tank and I would like to use a filler that mounts flush to the bedside. I don't think there would be any problem with fuel sloshing out once the cap is on because it's non vented. I will vent the tank and use a roll over valve for safety. Filling it might be a problem, do you think the pump will kick out before fuel sloshes out. Looks like the filler pipe in the tank is level with the ground. Happy Thanksgiving