Well I yanked the toilet over the weekend to see if I could get a better look at what is going on. I am starting to think that maybe I had the poop pyramid someone else here suggested. After I yanked the toilet, I made a bleach and water solution to clean up and disinfect the toilet flange and when I went to pour the rest of it down the drain the line was almost completely blocked. Next I grabbed my toilet auger and started working down the pipe. I cleared the blockage and got the drain to flow cleanly. When I was augering it felt like I met some resistance at one point that I was able to clear that could have been the pyramid. I also borrowed a friends borescope and took a look down the pipe as best I could. My line definitely makes a 90 degree turn to horizontal heading towards the outside of the coach and then it appears to make another 90 degree bend back to vertical where I think it drops into the tank but I can't be sure. Once my new toilet flange comes in, I am going to use the ice trick and get things as clean as possible. I am also going to keep the auger in the motorhome just in case. Then we will see what happens next time we take it out.
