Instead of the normal spin-fit bayonett fitting, I have the WasteMaster Cam-Loc. This system is very slick, doesn't leak and doesn't appear to wear with age/use. The PolyChute hose is also an excellent hose, and fits into the cam-loc system nicely.
In the foreground you can see i have the normal 3" black and 1.5" grey dump fittings. I read online that if you have them straight sideways that the lower rail gets gunk and contaminants in it which results in early failure of the valve. Thus, mine are mounted at an angle.
You can also see an orange bungee cord holding up my drain plumbing. It's attached, naturally, to L-Track on the underside of the bus. You can also see the aluminum angle metal holding up the grey tank inbetween the frame rails. In the background you can see the fresh water tank and blue PEX fresh supply line.
Anyway, no complaints at all; I was very pleased with how this worked out for us.