Two comments:
1. My truck only drops 5/8 inch when I connect the TM, fully loaded. That is why I do not need a WD hitch. At 2+ for you I certainlyt agree that it is likely necessary.
2. Some people use a 90 degree elbow at the end of the sewer hose and some just bend the hose. If you did not use an elbow try that. I have never had the host pop out. I also try to keep the the sewer cap resting on the hose end. This helps a little. Also, I pull the handle slowly but briskly. Not just a yank. I suspect it was the sudden force that knocked it out.
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