sewer drain on passenger side

Some units are built that way, typically when the bathroom or toilet is on the passenger side. The ACE 29.2 is built like that and the solution (from the factory) was to install a macerator with the hose on the other side. The tank gate valves are linked via cable and the switch for the macerator is in the same bin. I love having the macerator and it makes things so much easier and cleaner. If you can have that setup installed you can dump from either side. Just install the macerator in the pass side bin and run the hose up over or around the tanks to a bin on the other side. A hassle to do but once it's done it makes things much easier. And with a macerator there is no dependence on gravity. You can run the hose wherever it's easiest as opposed to standard slinky lines which you have to be more creative about how/where to run it since it must have a downhill flow.