I changed many diapers. My older son for 2 years and my son with DS and food sensitives for 6 years so I have seen the worse of that.
Probably the worse is why others drive away with dripping from the black water area after emptying their tank or stick the sewer hose over the fresh water nozzle just before leaving a site. Always wipe down a fresh water spigot and run a little water before hooking up your fresh water hose.
There will never be any agreement about the black water tank, to me, they are gross. If you use chemicals, they smell even worse than without. They drip when people drive away after emptying and take a lot of water to really rinse them clean. What puzzles me most is the people who say there is no odor involved as for every kind of toilet made, I have heard that they smell from some and others say they never have a smell.
I think composting toilets are great and the wave of the future!