WELL I don't know what a Coachmen Cross Country 376DS is, so I will just say what mine has. I have a 36' class A MH. the fresh water holding tank is about 40 gal. the gray water tank ( SHOWER AND DISH WATER) is the same, the black tank, ( u know what that is ) is 50 gallons. I would google the manufacture and see what your are. I think u will find more off the net than in the books. good luck and post back your finding.