I have a 3650RK also and fulltime. I had full hook up at last campground dumped often (before burbing). Was there for about 3 1/2 months with no problems. I pulled to next location over 250 miles away and hooked up. 2 days later I also noticed the rear belly dripping. Took it apart and behold it was leaking where the outlet pipe comes out. I was told this happens often from flexing because of the rear kitchen design (extra weight in rear). Sounds logical but thats where mine leaked at not on top. I used a radiator repair kit to fix (you know-for the abs plastic).
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