Did anyone see the NIssan Pathfinder commercial last night during the Bears game. Stated it had a towing capacity of 5000lbs then showed it pulling away with what appeared to be a 25-27' Airstream! Really?
My Roo 23SS has them, just can't see them unles you crawl underneath, there is no reason to see them on the 23SS because there are valves inside the unit that you use to open (drain) the lines. I would think it to be very similar in your 233S.
I too am having trouble with my 90 degree entry door holder. It has already been replaced once by dealer (warranty)and just this week-end one of the kids tried using it and it pulled out of the wall.
I thought about using SS nuts and bolts and drilling all the way through the wall and the door using large ss fender washers on the inside. Aesthetically it wouldn't be very visible on the inside, through the wall, it would be just above the floor.