Dennis,
I have a 2005 Monterey & my fuel tank has overflowed from the same hose as you discribe. I talked to the folks at Beaver, in Bend a few years ago. They told me the hose is a fuel tank vent. The hose on my coach also hung down quite a ways. I was advised to fasten the hose up as high as possiable above the tank and allow the free end to hang down. As you know, there is very little room above the tank to do this. I was able to push the hose up a couple of inches and that has helped, only very rarely will I get any fuel out of the vent line, usually when I top off the tank when the coach is on an angled drive.
Good Luck.
Stan Anderson