I think you will find that what you have been doing for years is neither legal nor sanitary. Grey water is water from your shower and washing machine. Can't see a problem with that being used in your paddock. It is your grey water in your paddock. But not so keen to see other people's grey water being used in a camp ground. This grey water is from unknown sources on public land. Two very different scenarios my friend.
In my local authority, black water from your kitchen or toilet can not be put onto your lawn or garden without treatment and then only on a graden that does not produce food. Perhaps you should check your local authority's health regulations.
My moderately sized camper doesn't belch any oil or smoke nor do I tear up any tracks. Not sure how my body oil is going to harm the environment because the last time I checked body oil was natural. I stick to walking tracks and try not to step on any cute, little furry animals although I may have been guilty on occasion of squashing a bug or two. My apologies.
And I'm also not having a shot at you personally either
It is legal. We don't all live in latte sipping suburbia.
I know the difference between grey and black. And I'm obviously not talking about toilet waste.
Kitchen waste goes into a grease trap, where it breaks down and is irrigated onto the land (actually there's quite a few steps inbetween that convert it to grey). Grey water is instantly pumped into the paddock. Livestock eat the grass. You eat livestock. Sanitary?
The 4wd you use to pull your camper belches smoke and oil, just like mine. Unless you have a magic engine that spews rainbows out the tailpipe. Your all terrains/mud terrains rip up the tracks.
You're deluded if you think you have zero impact on any environment you enter. Cumulatively, we all do. Even your 'footprints' in your chemically produced shoes leave some residue behind, which all adds up. Your pristine 'natural' body oils sweat out the moisturiser, deodorant, soaps, shampoos, sunscreen onto everything you touch.
Please - don't patronise us all with the 'I'm the only one who doesn't affect nature wherever I go' comments. No offence mate!