Add this to your inspection routine

+2
The same thing happened to me while we were on the Interstate headed home. I zip-tied mine up and then made sure that I replaced the missing nut with a nylock nut. When it went to  the factory for repairs, a second hanger was added. I checked both. I then fabricated a hanger bracket out of strap aluminum that loops around the gray water pipe and is fastened into the frame with one of the self-tapping screws. It was a pain to make, but I don't think either pipe will sag again.

Well since I never thought to inspect the nut in first place and since it's long gone I really can't say.  The replacement will definitely be the nylon locking type.  Installing backup hose clamps on both drain pipes is a really good idea.  

Last weekend while on our final trip for the season I exited off of the expressway and decided to fill up the gas tank before going on.  While pumping the gas an "Absolutely Wonderful" lady pulled up and asked me if I knew that I was dragging a pipe on the ground.  What?  I looked down an sure enough the drain pipe and valve assembly to the black tank was on the ground.  I don't know how far it had been drug (or dragged?) on the road but the end cap and plastic fitting was pretty much toast.  It could have been worse if the drain pipe had been ripped off and fortunately wasn't.  If she hadn't have said something I don't know that I'd even have seen it before heading back on the road.  Grabbed some zip ties and put the pipe back in place.  Ordered new parts from e-trailer for under $20 that should be here this afternoon.