Sewer smell

We had this issue with our new 2016 Sprinter. We tried everything that these posters suggested to no avail. It started after we were at a site where we had to use a dump station rather than a sewered site. It seems that our tank was a bit too full for the bumpy road to the dump station and tp and "solids" (I am trying to be a lady here) sloshed up the vent pipe. The pipe had a plastic course screen most of the way down the pipe. My husband used a long galvanized pipe and broke the screen out. We figure if something is dumb enough to go down that hole, they deserve where they end up. The clogged screen was keeping the black tank from being able to vent properly. It was just horrible. If you haven't already remedied your problem, this approach may help. It totally rectified our problem. Oh, BTW, Camping World and Keystone were no help at all. Color me surprised.