How many of us are there? Owners of Dodge based RV's?

I'm going to head out to the shop this afternoon and dig out my hand vacuum pump to see what I can see. If the diaphragm seems to hold vacuum properly and the can does as well, I'll then need to determine why this has 2 vacuum lines and where they belong. One will likely come off the canister, but the other? Maybe it was a vent line?