[jimcol]

Another common source of water in that area is the drain hose in the back of your refrigerator. The original hose is thin corrugated plastic. It cracks and falls apart over time, or pulls off of the nipple on the back of the refrigerator. To test if that is the source of your water have someone pour water in the drip pan in the back of your refrigerator while someone else observes the drain hose from the outside. Removing the bottom vent behind your refrigerator on the exterior of your 5'er will give you a good observation point.
I replaced mine with heavier plastic clear hose like you see on a humidifier drain.