I have been all over the underside of the rig and I can not find the fresh water tank drain. No blue line hanging below on the off door side near the axles. The only line I find is between the axles coming through the frame that appears to be a tank vent/overflow. Did Heartland just screw up and leave it in the belly somewhere? Can anyone else with a bighorn provide approx measurements to location and the weatherproofing is riveted in and before I start tearing into it I would like to know the approx area