I doubt they would do it again, but we had a 2004 Fleetwood Terra 32' that constantly plugged up. On that model, they had no room for the tank directly under the toilet. They made a tank that had an upper section that went over the frame. When you flushed, it would drop down into a 6" tall section that had an angle to it. The waste was SUPPOSE to slide down into the larger section of the tank. It was a nightmare.
We complained to Fleetwood, but they told us they never heard of the issue. We sold the coach and THEN got a recall notice for the tank. You can tell by looking under the coach at the tank design/configuration.