I use a coupler lock
similar to this when towing to ensure the coupler latch doesn't disengage while towing and a
coupler lock like this when the trailer is parked on a campsite.
An alternative to using a stinky slinky and support is a
waste macerator which will pump the waste even when there is a negative slope.
In theory the breakaway chains should be connected to the TV itself but like most others I simply snap them on to the hitch bracket which has holes in it for just that purpose. The key is to make sure the coupler is correctly latched to the hitch ball in the first place, in which case a total breakaway is highly unlikely. Simply put, I've got better things to worry about. ;)
I sanitize the fresh water tank in the spring with a bit of chorine, then fill the tank for the season and don't empty it fully until I winterize. Any water we ingest I bring from home or if on a long trip simply buy it as we go along.
