My neighbors have a new 2019 Winnebago Minnie Winnie 22M. Bathroom on passenger side. Black and grey tanks run north/south, on the passenger side. Drainage tube runs almost the width of the motorhome to the typical termination point on the driver's side, where the pull handles are located. Big problem.
The blade valves are on the passenger side, at each tank. There are two cables that also run the width of the motorhome, again... with the handles at the typical termination point.
They have just returned from a one month trip. The valves leaked the entire time. Took it back to the dealer right away. Dealer 'says' they replaced the blade valves. Still leaking when they got it home.
Sitting behind the motorhome on their patio the other day we noticed one cable was hanging so low it was in danger of getting snagged on road debris. Crawled under and found the cable ties that should hold it up next to the drain tube were missing, so we put new ones on. Investigation found the other cable poorly attached also. Plus it is about 3 feet too long, so the factory had just pushed it up in a cavity next to the gas tank.
Hence....you are pushing/pulling two handles on the driver's side, to force two cables that are just 'floating' around under there for approximately 6 feet...give or take...to activate the valve blades at the tanks, on the passenger side. Waaaayyyy too much slack in them. No way....are you going to keep those valves pushed tightly closed every time. Very poor design, appears to be what will be an ongoing problem and frustration.
And, if you don't make sure to 'raise' the passenger side while draining....the long tube does not completely drain. You will get a nice 'bath' when you take the cap off of the termination point the next time.
They do not put toilet paper down the toilet, for those that say that is the problem.
Needless to say, they are not happy.
2017 Winnebago Spirit 25b