I am used to cleaning out RV systems (when we went camping through Acadia) right after our wedding. Unfortunately, my in-laws used it for 3-4 days prior to us leaving. I had to empty the tanks on day 2, and man, talk about lumps traveling through the pipe and into the campground tank - and all you want to do is hold your breath. I also was disappointed at how things don't all fit tight - there is slop in the outlets and inlets of the campground tanks, likely due to having no "standard" set-up, but I was worried about backsplash.
I took it up a notch when the health care system I am with bought a mobile health unit - then I was able to empty a mobile health unit tank - party time, baby. My water treatment center has a "slide" you just fan it all down into their system - so lovely.
If I remember, my grandfather used to have an incinerator outhouse at his hunting camp. That was like burning logs in a blast furnace.
I understand it happens, and it's a "dad/husband" job, but there has to be a better way - even digging holes.