We had a bad clog in our first Montana. Someone pointed out we needed to put more water in the bowl, get the paper fully covered, before tripping the flush valve. No problems since. Apparently there was not enough water to wash everything all the way into the tank. Paper was getting part way down and sticking there. When it dries it's like concrete and just keeps building up. I like to never got that toilet unclogged. Now we're careful to cover all the paper before letting 'er rip.
