I have a family member who is going to park and live in their 5th wheel at my house for several months. The 5th wheel does not have a black water tank (not sure why). We are planning on hooking the sewer hose directly to the cleanout port of the house, but the inlet is level with the RV's outlet. I don't think we will get proper flow with this setup. Raising the 5th wheel is not an option due to clearance. Any ideas how to make this work?